Prep first
Before you start
- Blot up any wet residue right away so it doesn't run down the wall.
- Remove the rusty object before you clean the spot.
- Work on one small area at a time and keep the rest of the wall dry.
- If the paint lifts or changes color, stop and switch to the water-only approach.
Rust on a wall usually traces back to iron in the water or to a rusting object that shed onto the surface. The finish decides what's safe: bare tile or other unpainted wall can take a borax and lemon paste, but paint and wallpaper need the milder approach. A fresh spot on any wall should lift with a light touch, while an old one might just lighten instead of vanishing.
For rust stains on painted walls, start with plain water and a soft cloth, and avoid pressing hard. Rust stains on wallpaper or drywall are easy to damage, so test any remover in a hidden spot first. If the paper softens or the mark won't lift after two gentle tries, stop and call a pro.
Before you start
What walls can take
Use with care4
- Water
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Scrubbing and abrasives
Avoid1
- Soaking
6 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- Soft white clothsWhite cloths blot the stain without transferring any dye to the wall. (opens Amazon)
- Non-abrasive spongeIt holds only a little water, which is what a light wipe needs. (opens Amazon)
- BoraxIt forms the base of the paste rubbed into the rust stain. (opens Amazon)
- Lemon juiceMixed with the borax to make the paste. (opens Amazon)
- Rubber glovesThey protect your hands from the acid in the paste and from any rust remover. (opens Amazon)
- Stain-blocking primerIt seals a shadow that stays after washing, before you repaint. (opens Amazon)
As an Amazon Associate we earn from qualifying purchases.
5 steps
Step by step
Step 1 of 51 minute
Check the wall's finish first
Look at what covers the wall before any liquid touches it. The main steps suit bare tile and other unpainted surfaces, while painted and papered walls get the gentler approach covered further down.
If you can't tell, treat the wall as painted and stay with water only.
Step 2 of 5A few minutes
Test a hidden spot
Dampen a small hidden area, such as behind furniture or inside a closet door, with water and then with the paste. Wait a few minutes, rinse, and check for any color change or lifting finish before you treat the stain.
Step 3 of 5
Blot the stain with water
Wring a sponge or cloth until it's barely damp, then dab the stain from its edge toward the center. Blot dry with a clean white cloth, and repeat until the cloth stops picking up rust.
Step 4 of 5
Rub in the borax paste
Mix borax and lemon juice into a paste, rub it into the rust with a clean cloth, and let it dry where it sits. Don't wipe it off early, because the paste needs to dry before you rinse it away.
Careful. Never mix the lemon paste with chlorine bleach.
Step 5 of 5
Rinse and repeat if needed
Rinse the spot with clear water, then repeat the paste if the stain is still visible. Once it's gone, rinse again and dry the wall with a clean cloth.
Tip. If the stain is still visible after this, move on to the set-in options.
If you'd rather buy than mix
Best products for rust on walls
Keep microfiber cloths for wiping and drying the wall, and use a fresh, barely damp one for each pass so you don't spread the rust.
Amazon Basics Microfiber Cleaning Cloths
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on walls, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →How to tell it's working
The rust should fade with each light wipe, and the wall should look even once it's dry, with no water marks or sheen change. If the paint starts looking dull or rubbed, stop and let it dry. A spot that hasn't changed after two gentle rounds has likely penetrated, and the set-in method is the next step.
What changes for yours
Adjust for your walls
Interior walls
Interior walls are usually painted or papered, so start with the water-only steps and skip the paste. Check the finish first, since the paste belongs only on bare tile or other unpainted surfaces.
If the stain returns after cleaning, iron in your household water is the likely source, so have the water checked before you repaint. Once the stain is clean and dry, the wall is ready for its finish.
Painted walls
Painted walls take water and mild detergent only, applied with a barely damp cloth and rinsed off right away. Leave out the acid removers, the paste and any scrubbing, since the finish can't handle them.
If a shadow is still there after washing, let the wall dry and seal the spot with a stain-blocking primer before repainting. That keeps the rust from showing through the new coat.
Wallpaper
Wallpaper can't take acid removers or abrasives, and many papers don't tolerate much water at all. Test a hidden spot with a barely damp cloth, and stop if the paper softens or the color moves.
Some textured papers can't be washed at all, and grasscloth may need a professional cleaner. If the stain is still visible after a careful test, that's the point to call one.
Drywall
Drywall is treated here like a painted wall, so keep it gentle with plain water on a barely damp cloth and never soak it. Test a hidden spot first, and leave out the acid removers and the paste.
Dab rather than rub, and work in small patches so the wall doesn't get wet all over. If the rust is still visible after that, a stain-blocking primer is a safer next step than more cleaner.
Heavy or long-standing buildup
An old rust stain that has been there for a while won't come out with water alone. On bare tile or other unpainted surfaces, use an oxalic acid compound or a trichloro-melamine compound for a stubborn mark, and follow its directions very carefully.
If the rust has dried into the surface, mix oxalic acid crystals into hot water with enough whiting or talcum powder to make a soft paste. Spread it over the stain as a poultice, let it dry, then remove it, rinse thoroughly and polish.
Rust stains may be very difficult to remove, so expect to repeat the treatment before it fades. If a shadow stays after washing, seal it with a stain-blocking primer before repainting rather than chasing it with more acid.
Vinegar, baking soda, peroxide and more
Do home remedies work on rust on walls?
Kitchen remedies come up often for rust, but most of them don't match this stain. Each one is noted for where it fits on walls, or why it's ruled out.
Helps1Skip5Avoid1
What makes it worse
Mistakes to avoid
Don't use chlorine bleach on rust
Bleach is an oxidizer that makes rust stains more intense and sets them in place. Keep it out of the bucket, the cloths and the area altogether while you work.
Don't put acid removers on painted walls
Acid rust removers can strip sealers and pit or strip painted, coated, sealed and papered surfaces. The same goes for porcelain and enamel, so keep them off appliance finishes too.
Don't put the paste on painted or papered walls
Keep that borax and lemon paste for bare tile or other unpainted wall. On painted or papered walls, plain water and a mild detergent are the only products to use.
Don't handle oxalic acid without gloves
Oxalic acid is poisonous, so rubber gloves go on before the crystals or any mixed paste touch your skin. Wash your hands once the job is done, even if you wore the gloves.
Don't skip the test on a hidden patch
Rust removers and the paste can change how a finish looks, and the change may not show until the patch dries. Dampen a hidden patch, wait a few minutes, rinse, and check for color change before you go to the stain.
When to call a professional
Grasscloth wallpaper is the main case where a pro should step in, since it can need cleaning that a home approach can't safely give. For paint, a pale or dull patch left after cleaning is usually a touch-up job, and the store that sold the paint can help you match it.
Questions
Why does rust keep coming back on my wall?
It usually means iron keeps arriving with the water, or the rusty object is still shedding rust. Clean the spot, let it dry, and watch whether it returns. If it does, have your household water checked for iron before you repaint.
How do I know if a rust stain is set in?
If the stain is still visible after the water and paste steps, it has set in. At that point, move on to the set-in options and expect to repeat the treatment.
Is oxalic acid safe to handle?
Yes, with care. Oxalic acid is poisonous, so wear rubber gloves, keep it away from children, and rinse any residue off thoroughly.
What sponge should I use on a rust spot?
Use a non-abrasive sponge or a soft cloth. Stiff pads are hard on wall finishes, and they do the most damage to flat or matte paint.
Can I use these steps on grout between wall tiles?
Grout is a different surface with its own guide, and rust that has reached the grout lines often needs a different approach than the paint or paper around it. Check the Grout guide before cleaning it. Following its steps keeps the wall finish out of the cleaning process.
What about rust on a metal fixture on the wall?
Metal fixtures are a different surface, and rust on metal behaves differently from a stain sitting on paint or paper. Use the Metal, Chrome & Tools guide for the steps. Keep wall cleaners off the metal finish while you work.
Can I scrub a rust spot on a freshly painted wall?
Not for about two weeks. Washing newly painted walls sooner can alter or damage the finish, so leave the rust alone until then and deal with it once the two weeks are up.
Will a rust spot on a matte wall leave a dull patch?
It can, if you press hard or let the cloth run wet. Keep the cloth barely damp, use light strokes, and test a hidden patch first. Look for any change in sheen once it dries before you call the job done.
Can I clean a rust streak off wallpaper?
Only if the paper is labeled washable. Use a barely damp sponge with no abrasives, dry the paper right away, and don't soak it. Textured papers sometimes can't take water at all, and grasscloth is usually a job for a pro.
Does the bottom-up order matter when a rust streak runs down a wall?
Yes. Go from the bottom up, rinsing as you move, because rust runs down the wall and cleaning from the top sends fresh streaks into the section you haven't done yet.
Rust on other materials
Other stains on walls
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.