Prep first
Before you start
- Work out the cause first: where the mark is, how it smells and feels, and how it appeared.
- Test any cleaner on a hidden spot before you use it on the marks.
- Sweep off loose dirt before anything gets wet.
- Keep the surface wet while the cleaner works, then rinse well.
Black marks on concrete are most often rubber from tires and heels, but soot, mildew, greasy residue and manganese from well water can look the same on a slab. A fresh rubber smear usually responds well to cleaner and a brush, while a mark that has soaked in over a long time may only fade. Concrete is porous, so the surface has to stay wet for the whole job, or the marks just sink deeper.
To clean black spots off a patio without harsh chemicals, start with a mild cleaner and a stiff brush while the slab is still wet. Black mulch stains on concrete usually need a little more time and a second pass with the cleaner and stiff brush. Rinse well after each step so loosened residue doesn't dry back onto the slab.
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
4 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- Concrete cleanerBreaks the bond between the rubber or grime and the concrete. (opens Amazon)
- Stiff non-metal brushScrubs the marks without leaving rusting particles behind. (opens Amazon)
- Stiff broom or leaf blowerClears loose dirt and debris before anything gets wet. (opens Amazon)
- Garden hoseRinses away the cleaner and anything it loosened.
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5 steps
Step by step
Step 1 of 5
Sweep away the loose debris
Sweep or blow loose dirt and debris off the concrete so the cleaner can reach the marks. Brush off any dry soot or mildew at this stage rather than wetting it. Leave the surface dry for this part.
Step 2 of 5
Wet and cover the marks
Wet the whole area first so the concrete is saturated and the cleaner can work across the marks. Then apply a generous amount of concrete cleaner over the marks, making sure each one is entirely covered.
Step 3 of 5A few minutes
Let the cleaner work
Give the cleaner a few minutes to penetrate and break the bond between the rubber and the concrete. Keep the area wet while it sits, and mist more water onto any spot that starts to look dry.
Step 4 of 5
Scrub the marks
Work a stiff non-metal brush over each mark, adding more cleaner wherever the marks still look dark. Scrub one section at a time so the cleaner stays wet while you work.
Step 5 of 5
Rinse everything clean
Hose the area down until no cleaner or loosened debris runs off. Rinse onto the surrounding concrete too, so no cleaner dries in a ring at the edge of the marks.
Tip. If a faint shadow is left once it dries, go back over that spot with the cleaner and scrub again.
If you'd rather buy than mix
Best products for black stains on concrete, brick & driveways
Choose a concrete cleaner made for masonry surfaces, and test it on a hidden spot before you use it on the marks.
Overnight Stain Remover for Cleaning Oil Stains on Concrete
These are the everyday supplies the steps above use, in the versions most people buy on Amazon.
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
Dark rubber should loosen into gray residue on the brush and in the rinse water, which means the cleaner is breaking its grip. Check it only after the slab is bone dry, because it reads darker while damp. If the shadow hasn't moved once it dries, the mark has gone into the pores, and the poultice approach in the set-in section is next.
What changes for yours
Adjust for your concrete, brick & driveways
Patio and slab marks
Rubber from tires and heels is the most common cause of black marks on a patio or slab, and the steps above handle it. Work one mark at a time so the cleaner stays wet while you scrub. Marks that look dark after rinsing usually need another pass of the cleaner and scrub, not a stronger product.
Look at the slab from an angle in daylight once it's dry before you decide anything is left. If a faint shadow remains, repeat the cleaner and scrub on that spot only.
Mulch stains
Black mulch can leave a dark tint on concrete where it has sat against the surface for a long time. Pull the mulch back and sweep up the loose bits, then follow the steps on the tinted area.
Test the cleaner on a small hidden patch first, since a mulch tint may not react the way rubber does. If the tint is still there after a rinse, repeat the scrub on that spot before deciding it won't lift.
Olive tree marks
Fallen olives and leaves can leave dark marks where they lie on the concrete. Brush off the dry fruit and leaves before wetting anything, the same as with other dry debris.
Then follow the steps above, and repeat the scrub on any marks that are still dark after rinsing.
Heavy or long-standing buildup
Old marks that have soaked into the slab for a long time may not come up with the steps above. Deep, localized stains are treated with a poultice, a paste of talc, whiting, fuller's earth, diatomaceous earth or clay with a suitable solvent.
Spread the poultice at least 1/8 inch thick and cover it with plastic for 24 hours. Let it dry, then scrape or brush it off, and repeat as needed. For oily rubber marks, a commercial oil and tar remover is the solvent to pair with it, used with care and rinsed well.
Proprietary stain-specific cleaners are the better choice over homemade mixes. Older, built-up stains need stronger methods, and each one carries more risk of damaging the concrete, so start with the mildest option.
Vinegar, baking soda, peroxide and more
Do home remedies work on black stains on concrete, brick & driveways?
You can skip the cleaner and work with water and a stiff non-metal brush, which is the chemical-free route for this surface. Most household remedies don't suit concrete, so skip them and rely on water and a stiff brush. Pick the route that matches how much the mark has built up.
Skip5Avoid1
What makes it worse
Mistakes to avoid
Don't use chlorine bleach yet
Bleach can intensify manganese and iron marks, which can look black too. Hold off until you're sure the mark isn't either, and never mix bleach with ammonia, since it creates a toxic gas.
Don't wet dry soot or mildew
Brush or vacuum dry soot and mildew off before you wet the concrete. Brush mildew off outdoors so it's easy to sweep up.
Don't paint over the marks
Paint over mildew only hides it, and the growth keeps going underneath. Clean the concrete fully and let it dry before you decide whether it needs anything else.
Don't scrub a rubber mark before it's soaked
Dry scrubbing smears the rubber across the concrete and wears the surface before the cleaner has done its job. Saturate the marks and let the cleaner sit for a few minutes first, so the rubber loosens on its own.
Don't thin the poultice down
A poultice needs to be at least 1/8 inch thick and kept under plastic for about 24 hours to draw a deep mark out. A thin layer dries out before it can pull anything from the pores, so you lose a day for nothing.
Don't mix cleaners to make them stronger
Combining a concrete cleaner with bleach or vinegar can give off harmful fumes, and doubling up rarely lifts rubber any faster. Rinse between products, and stick to one cleaner per round.
When to call a professional
If the surface has a sealer, the cleaner may never reach the mark, and that's when a pro should take over. Historic stone or brick calls for a conservator rather than a home cleaning, and an unknown mark can be sent off as a sample for analysis. Tell them what the mark looked like when it appeared, what you've already used, and whether the surface is sealed.
Questions
What are black stains on concrete?
Black describes the color, not one substance, so the causes vary. Rubber from tires and heels is a common one on patios and slabs, and mildew, soot, manganese from well water and greasy residue also cause it. Some black marks are damage rather than dirt, and those may not lift fully.
Will black mulch stains come off concrete?
They can, when the tint sits on the surface. Pull the mulch back, sweep up the loose bits, and then clean the tinted area with the steps above. If it's still there after a rinse, repeat the scrub before deciding it's permanent.
Can I remove black olive tree stains without chemicals?
You can try it first. Sweep up dry fruit and leaves, wet the area, then scrub with a stiff non-metal brush and rinse well. Repeat the scrub on any marks that are still dark, and only move to the concrete cleaner if they don't lift.
What if I don't know what caused the black mark?
Test the cleaner on a small hidden spot before anything else. If that spot lifts, work through the steps on the rest of the marks. If it doesn't respond, the cause may be something else, so check the causes listed above before trying stronger methods.
Why do black marks come back after rinsing?
They usually didn't get the full treatment on the first pass, especially where the rubber was thickest. Apply the cleaner again to the spots that are still dark, scrub them, and rinse. If they survive a second pass, they may be an old set-in mark, which is the case the poultice option covers.
How long should the cleaner sit on the concrete?
A few minutes is enough for the cleaner to break the bond between the rubber and the concrete. Keep the surface wet while it sits, and mist more water onto any spot that starts to dry.
Can I power wash a black mark off a driveway?
Yes, but keep the pressure under 800 psi and use a wide fan tip held a foot or more from the surface. Warm water and a mild detergent usually do more than extra force, and old stone shouldn't be power washed at all.
Why should I soak the slab before I apply cleaner?
Dry concrete drinks in the cleaner and whatever it dissolves, pulling the rubber deeper than you want. Wetting the slab first keeps the solution working on top, where the rinse can lift it away.
Is household bleach safe to use on concrete?
Keep it for green growth like moss and algae, and never use it on natural stone. Hold off until you know the mark isn't manganese or iron, because bleach can deepen those stains. Bleach also gets a poor rating for rubber, so a plain concrete cleaner is the better first pick.
Black Stains 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.