Maintenance procedure · Written to ASD-STE100 Issue 9 · Formatted to ANSI Z535

Steam Iron Descaling

Domestic steam irons with a self-clean, Calc-Clean or anti-calc function — running the manufacturer's own descale cycle, clearing a marked soleplate, and the four-way disagreement about vinegar
ApplicabilityDomestic steam irons with a water tank and a self-clean, Calc-Clean, Calc'nClean or anti-calc function
Task time2 hr 2 min to 2 hr 50 min editorial estimate, not a measurement
PersonnelOne
Revisionv1 · 2026-07-29
BEFORE YOU BEGIN

Before you begin. This procedure is general reference information, not professional advice. Equipment varies by manufacturer, model, and year. Always follow the documentation supplied with your equipment — where it differs from this page, follow the manufacturer. Verify that you have the tools, the working conditions, and the ability to do this task safely. If anything is unclear, if the equipment is damaged, or if the task exceeds your experience, stop and use a qualified professional. You are responsible for your own safety and for the outcome. This site accepts no liability for any loss, damage, or injury arising from the use of this information.

Specifications marked unverified could not be traced to a manufacturer source. Do not rely on them — obtain the value from your equipment documentation.

Summary

Scale builds inside any appliance that boils water, and in an iron it announces itself the worst possible way: brown water spat onto a white shirt. The fix is a cycle the manufacturer already built into the machine — Philips calls it Calc-Clean, Bosch calls it Calc'nClean, most others just call it self-clean — and it works by flushing boiling water and scale out through the steam vents into a sink. It takes about twenty minutes of work, spread around two waits for the iron to cool.

The thing you will read everywhere else is to fill the tank with vinegar, and you should not do that on the strength of a web page, including this one. Philips lists vinegar by name among the things that must never go in the tank, alongside descaling agents and other chemicals, because they may cause water spitting, brown staining or damage. Russell Hobbs says an additive will destroy the anti-scale agent. Bosch's own iron manual says not to descale or clean the tank with cleaning products or solvents — and Bosch separately sells a descaling solution for a named list of its other iron models. Meanwhile Bosch, Russell Hobbs, Rowenta and Morphy Richards all describe white vinegar on the outside of a cold iron. Inside the tank and outside the soleplate are two different questions, four manufacturers give five answers, and this page prints all of them with names attached instead of picking one.

Safety

WARNING

DISCONNECT THE IRON FROM THE ELECTRICAL SUPPLY BEFORE YOU FILL IT OR EMPTY IT.
Bosch gives this instruction for its own irons. Contact with the supply can give you an electric shock.

Necessary equipment

ItemNote
SinkThe iron discharges the scale and the water into the sink.
Soft clothsUse a soft cloth on the body and on the soleplate.
Linen cloth optionalBosch names a linen cloth for a heavily marked soleplate.
Old cotton clothThe iron moves across this cloth after the cycle.
The water your manufacturer names materialRead the documentation for your model. The manufacturers do not give the same mixture.

Prepare the iron

Estimated 1 hr 7 min to 1 hr 16 min

NOTEThe correct method is different on different makes. Read your documentation first.
  1. Read the care instructions in the documentation for your model.
    • The manufacturers do not agree about the descaling agent, the water or the interval.
    • The specifications on this page give each disagreement in full.
    4m
  2. Disconnect the iron from the electrical supply.
    • Bosch tells you to remove the plug before you fill the iron or empty it.
    <1m
WARNING

LET THE IRON BECOME COOL BEFORE YOU TOUCH THE SOLEPLATE.
Panasonic says that hot water splashes from an iron immediately after use. Contact with the soleplate can burn your skin.

  1. Let the iron become cool.
    • Panasonic gives 60 minutes before maintenance work on a steam iron.
    • Panasonic says that hot water splashes from an iron immediately after use.
    1h
  2. Empty the water tank into the sink.
    • Panasonic says that water in the tank makes more scale.
    • Bosch tells you to hold the front of the iron down and shake it gently.
    1m
  3. Find the self-clean control on your iron.
    • Philips gives the name CALC CLEAN for this control.
    • Bosch gives the name Calc'nClean for the equivalent function.
    • Some irons have no such control. The documentation for your model tells you.
    2m

Fill the water tank

Estimated 3 min

NOTEWhat goes into the tank is the part the manufacturers disagree about.
Descaling agent — chemical compatibility
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR YOUR MODEL BEFORE YOU PUT ANY CHEMICAL INTO THE WATER TANK

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

This is the disagreement the page exists for, and one manufacturer is on both sides of it. AGAINST ANY CHEMICAL IN THE TANK: Philips (philips-iron-water-type, accessed 2026-07-29) says 'Please do not use perfumed water, water from the tumble dryer, vinegar, starch, descaling agents, ironing aids, chemically descaled water or other chemicals as they may cause water spitting, brown staining or damage to your steam iron or garment steamer' — vinegar and descaling agents named together and both prohibited. Bosch's own iron operating instructions (bosch-tda10-iron-instructions, accessed 2026-07-29) state 'DO NOT de-scale or clean the water tank with cleaning products or solvents, as these could cause the iron to drip when using the steam function', and on filling: 'Use only clean water from the tap without mixing anything with it. The addition of other liquids, (unless recommended by Bosch) such as perfume, will damage the appliance. Any damage caused by the use of the aforementioned products will make the guarantee void.' Russell Hobbs (russellhobbs-prevent-limescale-iron, accessed 2026-07-29) says 'Don't use a descaling solution or additives in the water or you'll destroy the anti-scale agent'. FOR A PROPRIETARY DESCALING AGENT: Bosch UK (bosch-iron-descaling-solution, accessed 2026-07-29) sells and recommends its own descaling solution for steam irons and steam stations, 'Removes limescale quickly and effectively and protects your appliance from harmful deposits', for a named model list — 'Suitable only for models: TDA30../TB40.., TDA50.., TDA70../TDA75../TB60.., TDi90../TDi95../TSi80.., TDS11../TS11.., TDS12../TS12.' — at an interval of every 3 months, and adds 'For other models, we recommend using 50% deionised or distilled water to reduce limescale build up'. So Bosch prohibits a chemical descale on the TDA10 and sells one for the TDA30 and above. This page does not average these, does not rank them and does not choose between them, and it prints no descaling agent of its own. A steam chamber, an anti-scale cartridge and a soleplate coating are per-model, and only the maker of your iron knows what attacks them. If your documentation names no descaling agent, use the self-clean function and water only.
Water for the tank
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR YOUR MODEL. THE MAKERS GIVE DIFFERENT MIXTURES FOR A HARD WATER AREA

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

All the sources agree that a steam iron runs on tap water and disagree on what to do about hard water, giving three different dilutions. Philips (philips-iron-water-type, accessed 2026-07-29): 'Your steam iron or garment steamer has been designed to be used with tap water' and, for hard water, 'it is recommended to use distilled or demineralized water (50% demineralized water mixed with tap water could be used too)'. Bosch's iron operating instructions (bosch-tda10-iron-instructions, accessed 2026-07-29): 'This appliance has been designed to use normal tap water. To prolong the optimum steam function, you may mix tap water with distilled water 1:1. If the tap water in your district is very hard, mix tap water with distilled water 1:2.' Bosch UK (bosch-iron-descaling-solution, accessed 2026-07-29) gives '50% deionised or distilled water' for the models its descaling solution does not cover. Russell Hobbs (russellhobbs-prevent-limescale-iron, accessed 2026-07-29): 'Use distilled water instead of tap water in your iron if you live in a hard water area' — with no mixing at all. That is 50/50, 1:1, 1:2 and neat distilled, for the same problem, from four documents. The dilution is not a detail: too little mineral content stops some irons from producing steam at all. Use the ratio in your own documentation.
  1. Find the water that your documentation names.
    • Philips designed its steam irons for tap water.
    • Philips gives distilled or demineralised water in an area with hard water.
    • Bosch gives a mixture of tap water and distilled water in a very hard area.
    2m
NOTICE

PUT ONLY THE WATER THAT YOUR DOCUMENTATION NAMES INTO THE TANK.
Philips prohibits vinegar and a descaling agent in its irons. Russell Hobbs says that an additive destroys the anti-scale agent.

  1. Fill the water tank to the maximum mark.
    • Bosch tells you to hold the iron at 45 degrees with the point up.
    • Bosch tells you not to fill the tank above the max mark.
    1m
  2. Do not put any other liquid into the tank.
    • Philips prohibits vinegar in the tank. Philips also prohibits starch and a descaling agent.
    • Bosch prohibits any addition that Bosch does not recommend.
    • Bosch says that damage from such a product makes the guarantee void.
    <1m

Do the self-clean cycle

Estimated 11 min to 15 min

  1. Do the self-clean sequence that your own documentation gives.
    • The sequence below is the shape that Philips and Bosch each give.
    • The controls and the order are different on each make.
    <1m
  2. Connect the iron to the electrical supply.
    <1m
  3. Set the temperature control to its maximum position.
    • Philips tells you to select the maximum temperature and no steam.
    • Wait until the indicator lamp is off.
    3m
  4. Disconnect the iron from the electrical supply.
    • Philips and Bosch each tell you to disconnect the iron before the discharge.
    <1m
WARNING

HOLD THE IRON ABOVE A SINK BEFORE YOU OPERATE THE SELF-CLEAN CONTROL.
Bosch says that the soleplate discharges boiling water and steam. The water from the soleplate can burn your skin.

  1. Hold the iron above the sink with the soleplate horizontal.
    • Philips tells you to hold the iron with the soleplate horizontal.
    • Keep your hands and your face away from the soleplate.
    <1m
  2. Operate the self-clean control.
    • Bosch says that the soleplate discharges boiling water and steam.
    • The water carries the scale and the deposits from the steam chamber.
    <1m
  3. Move the iron gently until the water tank is empty.
    • Philips tells you to shake the iron gently until it is empty.
    2m
WARNING

PUT THE IRON ON ITS HEEL WHEN YOU STOP WORK.
Bosch says never to rest the iron flat while the soleplate is hot. A hot iron on a cloth can start a fire.

  1. Put the iron on its heel.
    <1m
  2. Connect the iron to the electrical supply.
    <1m
  3. Let the last water evaporate.
    • Bosch tells you to heat the iron again until the last water evaporates.
    3m
  4. Move the hot iron across an old cotton cloth.
    • Philips tells you to heat the iron and move it across a cloth.
    • This removes the last of the deposits from the steam vents.
    1m

Clean the soleplate

Estimated 39 min to 1 hr 14 min

Soleplate cleaning method — chemical compatibility
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR YOUR MODEL. A COATED SOLEPLATE AND A STAINLESS SOLEPLATE ARE NOT THE SAME PART

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

The vinegar answer flips depending on whether it is inside the iron or outside it, and the sources have to be read that way or they look like nonsense. OUTSIDE, VINEGAR IS PERMITTED BY SOME MAKERS: Bosch's iron operating instructions (bosch-tda10-iron-instructions, accessed 2026-07-29) give, for a heavily stained soleplate, 'While the iron is cold, iron a linen cloth soaked in white vinegar', then 'dampen a cloth with water and wipe the soleplate clean and dry thoroughly', and separately 'If the steam regulator needle is soiled, remove any deposits from the tip with vinegar and rinse it off with clean water'. Russell Hobbs (russellhobbs-prevent-limescale-iron, accessed 2026-07-29): 'Gently remove any spots from the soleplate, using a little vinegar on a soft, dry cloth so as not to scratch the surface.' Rowenta (rowenta-how-to-clean-an-iron, accessed 2026-07-29): 'Diluted white vinegar can help remove more stubborn marks', with the qualifications 'Avoid direct application on hot surfaces', 'Never scrape the soleplate with metal tools or use harsh chemicals' and 'Don't mix descaling solutions or household acids'. Morphy Richards (morphyrichards-clean-a-steam-iron, accessed 2026-07-29) goes further and names white vinegar for both the vents — 'Mix a small amount of water and white vinegar solution. A small cupful should be more than enough.' — and the soleplate, by soaking a towel in white vinegar. NO MAKER PERMITS IT INSIDE: see the descaling-agent specification above, where Philips names vinegar in its prohibited list and Bosch prohibits cleaning products and solvents in the tank. Two makers on this list also caution against the temperature at which the vinegar is applied, and Bosch requires a cold iron. This page does not resolve the disagreement. It publishes it, and it prints no soleplate chemical of its own, because a non-stick coating, a ceramic coating and a bare stainless soleplate do not react alike and only the maker knows which one you own.
  1. Disconnect the iron from the electrical supply.
    <1m
  2. Let the iron become cool again.
    30m
NOTICE

DO NOT USE A METAL TOOL OR AN ABRASIVE ON THE SOLEPLATE.
Rowenta says never to scrape the soleplate with a metal tool.

  1. Clean the body and the soleplate with a damp cloth.
    • Bosch gives a damp cloth for a soleplate with light marks on it.
    • Dry the soleplate after this.
    2m
NOTICE

DO NOT PUT VINEGAR INTO THE WATER TANK.
Philips names vinegar in its list of prohibited liquids. The soleplate methods below are for the outside of the iron only.

  1. If a mark stays, use only the method that your documentation names.
    • Bosch tells you to move a cool iron across a linen cloth with white vinegar on it.
    • Russell Hobbs gives a little vinegar on a soft dry cloth for a mark.
    • Philips names no vinegar method at all. Use your own documentation.
    5m
  2. Remove all the vinegar from the soleplate with clean water.
    • Bosch tells you to make a cloth damp with water and dry the soleplate.
    2m

After the job

Estimated 2 min

Descaling interval
Unverified — do not rely on this value
CONSULT THE MANUFACTURER DOCUMENTATION FOR THE INTERVAL

No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.

Four tier-1 sources give four intervals for the same job, spanning a factor of six. Panasonic (panasonic-descale-steam-iron, accessed 2026-07-29): 'Internal cleaning shown below should be done approximately once every 2 weeks.' Bosch's iron operating instructions (bosch-tda10-iron-instructions, accessed 2026-07-29), for Calc'nClean: 'Use this function approximately every 2 weeks if the water in your area is very hard' — the same two weeks, but conditional on water hardness where Panasonic's is not. Russell Hobbs (russellhobbs-prevent-limescale-iron, accessed 2026-07-29): 'Use the self-clean function on your iron every month to clean the system.' Philips (philips-iron-descale, accessed 2026-07-29): 'Repeat this whole process once a month, or more if necessary' and 'Descaling your Philips Steam Iron every 1-2 months can prevent brown stains, brown water and leaking.' Bosch UK (bosch-iron-descaling-solution, accessed 2026-07-29) gives every 3 months for its proprietary solution. This page prints all of them and averages none of them. Water hardness varies by street, so an interval that is right in one house is wrong in the next; the honest trigger is the one every source implies — descale when the iron spits, stains or steams weakly, at no less than the interval your own maker gives.
  1. Empty the water tank after each use from now.
    • Panasonic says that water in the tank makes more scale.
    <1m
  2. Store the iron on its heel in an upright position.
    • Bosch tells you to coil the cable loosely around the heel before storage.
    <1m
  3. Record the date.
    • The manufacturers do not give the same interval. Use your own.
    <1m

Terminology

This page uses one term for each item and holds it throughout, as ASD-STE100 requires. Equipment sellers and other guides use the names below for the same parts.

soleplate
Also called: sole plate, the flat metal bit, iron plate, base plate, the bottom of the iron, ironing plate
scale
Also called: limescale, lime scale, calcium, calc, mineral deposits, white flakes, chalk, furring
self-clean control
Also called: self clean button, calc clean, calc-clean, Calc'nClean, anti-calc, anticalc, descale button, cleaning function
steam iron
Also called: iron, clothes iron, flat iron, steam generator iron, steam station
water tank
Also called: reservoir, water reservoir, tank, water chamber, the bit you fill

When to use a professional

Stop if the iron leaks water from the body or from the joint of the tank. Bosch says that an iron with a water leak must go to an authorised service centre. This procedure does not repair a leak.

Stop if the iron does not make steam after two self-clean cycles. The cause is then a blocked steam chamber, a spent anti-scale cartridge or a failed pump. This procedure does not reach any of them.

Stop if the cable or the plug has damage. Do not use the iron. Bosch says that only qualified personnel can replace a faulty mains cable.

Do not open the iron. A steam iron has no user-serviceable parts inside it. An incorrect assembly makes an electrical risk that you cannot see.

Common questions

Can I put vinegar in my steam iron to descale it?

Not on the say-so of a web page, and at least three manufacturers tell you not to. Philips lists vinegar by name among the things that must never go in the tank — alongside perfumed water, starch, descaling agents and chemically descaled water — because they may cause water spitting, brown staining or damage to the iron. Russell Hobbs says a descaling solution or additive in the water will destroy the anti-scale agent. Bosch's own iron manual says not to descale or clean the water tank with cleaning products or solvents, because it can make the iron drip when you use steam. Modern irons have an anti-calc cartridge or a resin the acid attacks, which is the mechanism behind all three warnings. The self-clean cycle exists precisely so you do not need a chemical.

So why does everyone say vinegar works on an iron?

Because there is a version that several manufacturers do endorse, and it is on the outside of the iron rather than inside it. Bosch tells you that for a heavily stained soleplate you should iron a linen cloth soaked in white vinegar while the iron is cold, then wipe it with a damp cloth and dry it. Russell Hobbs says to remove spots from the soleplate with a little vinegar on a soft dry cloth, and Rowenta says diluted white vinegar helps with stubborn marks but tells you to avoid applying it to hot surfaces. Morphy Richards names a water and white vinegar solution for clearing blocked vents. Every one of those is external: the advice travels, loses the word 'soleplate' on the way, and turns into 'fill the tank with vinegar', which is the version the manufacturers prohibit.

Is there any descaling product I can use?

Only if your own manufacturer names one, and this is where Bosch contradicts Bosch, which is worth knowing before you buy anything. The Bosch TDA10 manual says do not descale the water tank with cleaning products or solvents. Bosch UK separately sells a descaling solution for steam irons and steam stations, recommends it every three months — and publishes a specific model list it is suitable for, which starts at TDA30 and does not include the TDA10. For models the solution does not cover, Bosch's advice is 50% deionised or distilled water instead. That is not the manufacturer being inconsistent; it is two different machines with two different steam chambers. It is also exactly why this page refuses to name a product for your iron.

How do I run the self-clean cycle?

The shape is the same on most irons and the buttons are not, so use your own manual for the detail. Philips describes it as: fill the tank, heat the iron to maximum with no steam, wait for the light to go out, unplug, hold the iron over the sink with the soleplate horizontal, activate Calc-Clean, and shake gently until it is empty while water, steam and scale come out of the vents. Then heat it again and glide it over a cloth. Bosch's version on the TDA10 involves removing the steam regulator and pouring about 150 ml of water into the hole. Both end the same way and both warn that what comes out is boiling. Do it over a sink, never over your hand.

How often should I descale an iron?

There is no agreed answer, and the spread is a factor of six. Panasonic says internal cleaning approximately once every two weeks, and Bosch says to use Calc'nClean roughly every two weeks if your water is very hard — the same figure with a condition attached. Russell Hobbs says to use the self-clean function every month. Philips says once a month, or every one to two months to prevent brown stains and leaking. Bosch UK's proprietary solution is every three months. Water hardness varies street by street, so treat your own manual as the floor and descale sooner if the iron spits, stains or steams weakly.

What water should I put in a steam iron?

Tap water, unless you live somewhere hard — and then the four sources give four different dilutions. Philips designs for tap water and recommends distilled or demineralized water in hard areas, noting that 50% demineralized mixed with tap will also do. Bosch says normal tap water, 1:1 with distilled to prolong the steam function, and 1:2 with distilled if your district is very hard. Bosch UK says 50% deionised or distilled, and Russell Hobbs says just use distilled. Do not assume neat distilled is always safest: some irons need the mineral content to make steam at all, which is why the ratios exist. Nobody sensible uses water from the tumble dryer, which Philips also has to tell people.

My iron is spitting brown water onto my clothes. Is it ruined?

Usually not — brown water is the classic symptom of scale in the steam chamber, and that is what the self-clean cycle is for. Philips says directly that descaling every one to two months prevents brown stains, brown water and leaking. Run the cycle, clean the soleplate, and try it on an old cloth before it goes near a shirt. If it still spits after two cycles, or if it leaks water from the body rather than the vents, stop using it: Bosch says an iron that leaks water should be checked by an authorised service centre before it is used again.

Sources

Every specification on this page is traced to one of these sources. Tier 1 is a manufacturer document, a published standard, or a government safety authority. See Standards for the full tiering rule.

  1. Tier 1What type of water can I use in my Philips Steam Iron or Steamer?Philips (Versuni Holding B.V.) · accessed 2026-07-29 · re-verification due 2027-01-25
  2. Tier 1How do I descale my Philips Steam Iron?Philips (Versuni Holding B.V.) · accessed 2026-07-29 · re-verification due 2027-01-25
  3. Tier 1Bosch TDA10 steam iron — operating instructions (9000930382_A)BSH Hausgeräte GmbH (Bosch Home Appliances) · accessed 2026-07-29 · re-verification due 2027-01-25
  4. Tier 100311972 Descaling solution for steam ironsBSH Home Appliances Ltd (Bosch Home Appliances GB) · accessed 2026-07-29 · re-verification due 2027-01-25
  5. Tier 1How to prevent limescale in your ironRussell Hobbs (Spectrum Brands UK Ltd) · accessed 2026-07-29 · re-verification due 2027-01-25
  6. Tier 1How to Clean an Iron Safely (Including Descaling)Rowenta (Groupe SEB USA) · accessed 2026-07-29 · re-verification due 2027-01-25
  7. Tier 1How to Clean and Descale Steam IronPanasonic Corporation (Panasonic Middle East and Africa) · accessed 2026-07-29 · re-verification due 2027-01-25 · automated link check returned 403 — verified by hand
  8. Tier 1How to Clean a Steam Iron: The Ultimate GuideMorphy Richards (Glen Dimplex Home Appliances) · accessed 2026-07-29 · re-verification due 2027-01-25

Revision history

Current version 1 · updated 2026-07-29 · next review due 2027-07-29

  1. v1 · 2026-07-29First draft. Sourced to Philips, Bosch, Russell Hobbs, Rowenta, Panasonic and Morphy Richards iron documentation. Four specifications publish as consult-the-manufacturer with conflict notes: the descaling agent (Philips, Bosch's TDA10 manual and Russell Hobbs each prohibit a chemical in the tank while Bosch UK sells one for a named list of other models), the water dilution (50/50, 1:1, 1:2 and neat distilled from four documents), the interval (two weeks to three months) and the soleplate method (four makers permit white vinegar outside the iron; none permits it inside). No specification is marked verified: writing data/specs.json is refused to a delegate at every level (config.json models.never_delegate_human). Source entries are staged in data/sources-additions-descale-a-steam-iron.json.

Corrections to this page are listed in the public corrections log. Reports that are credible and not yet verified are listed in the public errata register, and an open one renders above the step it concerns.

Comments and corrections

Found an error? A correction with a manufacturer source is applied and logged publicly. You can also write to corrections@fixchecklist.com.

Every step above carries its own report control, which tags the report with that step so a correction reaches the right place. For anything about the procedure as a whole — the order of the sections, a step that is missing, something that did not match your equipment — use this: report something about this whole procedure.

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