First few minutes
Just happened? Do this first
- Ventilate the area and wear household gloves and an N95 dust mask while you handle soot or ash.
- Don't touch or wipe soot during your first look around, since handling it spreads it from spot to spot.
- Vacuum loose soot with the nozzle slightly above the surface and no brushes.
- Wash any ash off your skin promptly.
Smoke soot on concrete is a dusty layer with an oily film, and that film sinks into the surface's pores if it gets wet too early. A small mark from a smoke bomb or a few cigarette ashes can come up with an art-gum eraser and one round of cleaning, but an old or deep stain can only be lightened. Dry work decides this one, since water and cleaner only go on after the loose soot is gone.
Sweep or vacuum every bit of loose soot off the surface, and use a stiff brush so you don't push it deeper. Removing creosote stains from concrete usually takes two or three rounds, so don't expect one pass to finish it. If a smoke bomb stain won't budge, repeat the dry work and the cleaning round before calling it set for good.
Before you start
What concrete, brick & driveways can take
Safe to use3
- Water
- Hot water
- Soaking
Use with care5
- Chlorine bleach
- Oxygen bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
7 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- Vacuum with no brush or beater barLifts loose soot without spreading it around. (opens Amazon)
- Art-gum eraserLifts a small stain without wetting it. (opens Amazon)
- Dry chemical spongePicks up residue before any liquid is used. (opens Amazon)
- Powdered all-purpose cleanerMixed with water to make the cleaning solution. (opens Amazon)
- Clean water and spongesFor saturating the area and rinsing the cleaner away. (opens Amazon)
- Household glovesProtects your hands and lungs from soot and ash. (opens Amazon)
- An N95 dust mask (opens Amazon)
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6 steps
Step by step
Step 1 of 6
Vacuum the loose soot dry
Put on household gloves and an N95 mask before you start. Hold the vacuum nozzle slightly above the concrete, with no brushes or beater bar attached. Clear all the loose soot first, because wetting it can push it deeper.
Step 2 of 6
Lift a small stain with an eraser
If the stain is small, rub it with an art-gum eraser to lift as much smoke and soot as you can. Wipe the crumbs away with a dry cloth. Larger stains skip this step and go straight to the sponge work.
Step 3 of 6
Work the dry chemical sponge over it
Rub the dry chemical sponge across the whole stain until it stops picking up soot. Turn to a clean side as it fills. Keep this part dry, because no liquid should touch the stain yet.
Step 4 of 6
Saturate the stain with water
Pre-wetting is required before any cleaning solution goes on, so saturate the whole area first. Keep it wet until you reach the rinse.
Step 5 of 6
Sponge on the cleaning solution
Mix 1/2 cup of powdered all-purpose cleaner into 1 gallon of water. Dip a sponge in the solution and rub the stain, working from the edges toward the center.
Step 6 of 6
Rinse well and let it dry
Rinse the area well with clean water so no cleaner is left behind. Then let the concrete dry completely before you judge the result.
If you'd rather buy than mix
Best products for smoke on concrete, brick & driveways
Use a plain powdered all-purpose cleaner for the solution, and a proprietary stain-specific cleaner for older stains rather than a homemade mix.
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 concrete, brick & driveways, 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.
If the stain was already dried or set, the method changes.
Old, dried or set-in stains →When to call a professional →How to tell it's working
The mark should lighten after each scrub and rinse, and the residue should lift off the sponge rather than smear. Look at the result only after the slab has dried completely, since damp concrete always looks darker than it will end up. If two rounds leave the mark exactly as it was, the soot has probably set in, and the poultice steps are next.
What changes for yours
Adjust for your concrete, brick & driveways
Smoke bomb residue
Smoke bomb residue behaves like soot on concrete, so the same order of work applies. Vacuum it dry, then go to the dry chemical sponge before any liquid touches it.
If it leaves a dark, greasy film after the sponge step, use the same powdered cleaner solution and rinse it well. Let the area dry before you judge the result.
Cigarette ash
Cigarette ash is light and loose, so lift it dry before anything else and don't rub it into the concrete. Only the sponge and cleaner steps change here, since the dry removal still comes first.
If a mark is left after rinsing and drying, treat it as an older stain and use the poultice method in the set-in section.
Old, dried or set-in stains
Older soot that has built up over months needs more than a sponge. Expect it to take longer, and expect more risk of damage to the concrete.
Once the area is dry, mix a poultice from talc, whiting, fuller's earth, diatomaceous earth or clay with a solvent suited to the stain. Spread it at least 1/8 inch thick over the stain, cover it with plastic, and leave it for 24 hours. Let it dry, then scrape or brush it off.
If the stain is still there, repeat the poultice as needed. Proprietary stain-specific cleaners are a better choice than homemade mixes. If the mark won't budge after several rounds, a testing laboratory can identify it, or a professional can take over.
Vinegar, baking soda, peroxide and more
Do home remedies work on smoke on concrete, brick & driveways?
Many home remedies float around for smoke and soot, but most are built for fabric or other surfaces. Concrete can take only so much, so a dry chemical sponge and a powdered all-purpose cleaner are the safest fit.
Skip6
What makes it worse
Mistakes to avoid
Don't use a fragranced cleaner
Scented products only mask the smoke odor, so the smell comes back once the area dries. Stick with the unscented powdered cleaner in the steps.
Don't skip the dry pass
Wetting soot before you have vacuumed and sponged it dry is how it sets into the concrete. Clear every loose bit first, then bring in water.
Don't mix bleach and ammonia
Those two react to form a toxic gas, and smoke residue doesn't call for either one. If a mark won't lift, change one product at a time and rinse between rounds instead of stacking cleaners.
Don't wet a small mark before erasing it
Water turns loose soot into a paste that spreads past the edge of the mark. Erase it dry with an art-gum eraser first, and wet the concrete only once the surface is clear.
Don't pull a poultice off early
A poultice needs to stay under plastic for a full 24 hours, at least 1/8 inch thick, and dry completely before you scrape or brush it away. Lifting it early leaves the residue in the pores.
When to call a professional
Bring in a restoration specialist if the masonry is historic or if a sealer or water repellent keeps the cleaner from working. When you can't identify the mark, a testing lab can sample it, which is far safer than escalating to stronger chemicals on your own. Give them the history: that it came from smoke, how old it is, and every cleaner already tried.
Questions
Will a smoke stain come out of concrete completely?
Often, but not always. Recent soot lifts more easily than older buildup, which needs stronger work such as a poultice and carries more risk of damage.
Can I use a regular vacuum on soot?
Yes, as long as you hold the nozzle slightly above the surface and skip the brushes and beater bar. Do this before any water touches the stain.
How thick should a poultice be on concrete?
Spread it at least 1/8 inch thick and cover it with plastic for 24 hours. Let it dry fully before you scrape or brush it off, and repeat if the stain remains.
Can I add ammonia to the cleaner for extra power?
No. No, the powdered all-purpose cleaner solution is all this stain needs, so skip adding ammonia.
Should I use vinegar on the concrete?
Skip vinegar; if you do use it, use only white vinegar, since colored vinegar can leave its own stain. If you do use vinegar, use only white vinegar, because colored vinegar can leave a stain of its own.
Do I need a mask for smoke residue?
Yes, a dust mask, preferably an N95, is the right choice while you handle soot or ash. Add household gloves and good ventilation, since soot is oily and sticks to skin. Wash any ash off promptly once you are done.
Can I pressure wash a smoke mark off concrete?
Not as a first step. Smoke soot should be dry-lifted and erased before any water goes on, because a jet of water can drive the film deeper. If you use a pressure washer later, stay well under 800 psi and keep the nozzle moving.
Do I have to rinse the cleaning solution off?
Yes, and rinse more thoroughly than you think you need to. Leftover solution dries into a film and can leave its own mark on the slab. Rinse with clean water until nothing soapy remains, then let the concrete dry fully before you judge the result.
Is bleach safe for cleaning smoke off concrete?
Not for smoke. Household bleach has a use on concrete against moss, algae and similar growth, but it does nothing for soot. Stick to the powdered cleaner and rinse steps for this stain, and test any stronger product on a small hidden area first.
Smoke on other materials
Other stains on concrete, brick & driveways
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.