How to Get Black Stains Off a Concrete Driveway in Mobile

Concrete driveways in Mobile don't stay clean for long. Give it a couple of years and you've got dark blotches, black streaks under the shade, and a general grimy cast that makes the whole front of the house look tired. Most people reach for a garden hose or a jug of bleach, get frustrated, and assume the stains are permanent. Usually they're not — you're just fighting the wrong enemy.

Know what you're looking at first

Not all "black stains" are the same thing, and the fix depends on which you have:

• Black or dark-green blotches, worst in the shade — this is algae and mildew, the most common culprit here. It's alive and it feeds on our humidity.
• Dark tire tracks near the garage — tire marks and ground-in rubber, plus oxidized road grime.
• Rainbow-sheened dark spots — oil or transmission fluid that's soaked into the pores.
• Orange-brown streaks — rust, usually from sprinklers, patio furniture, or fertilizer, not algae at all.

Why bleach and a hose don't fix it

For the algae type, a garden hose just rinses the top layer and the growth returns in weeks. Household bleach lightens it briefly but doesn't clean the grime out of the concrete's pores, and it can kill the grass along the edges. Oil stains laugh at both — the fluid is inside the slab, so surface cleaning does nothing. That's why DIY driveway cleaning is so often disappointing: the surface looks a little better for a week, then it all comes back.

What actually works

Concrete is one of the few surfaces tough enough for genuine high pressure, and the tool that makes the difference is a surface cleaner — a spinning attachment that applies even pressure across the whole slab instead of the zebra-stripe wand marks you get from a pointed nozzle. Paired with the right pre-treatment, that's how you get an even, fully-clean finish:

• Algae/mildew: pre-treat to kill the growth, then hit it with a surface cleaner so it doesn't just grow back.
• Oil: a degreaser worked in before pressure washing pulls fluid up out of the pores — older, deep stains may lighten rather than vanish completely, and we'll tell you honestly which yours is.
• Rust: needs a dedicated rust remover, not pressure alone — blasting rust usually just spreads it.

The honest part

Some stains are permanent — deep old oil, or rust that's been baking in for years — and any company that promises a driveway will look brand-new isn't being straight with you. But the vast majority of what makes a Mobile driveway look dirty is algae and grime that comes right up with proper treatment and a surface cleaner. Most driveways clean up far better than owners expect.

Keeping it clean

Plan on cleaning a driveway here every year or two — sooner if it's shaded by oaks or stays damp. Redirect any sprinkler heads that spray the concrete (rust and algae both love the constant moisture), and clean up oil drips before they soak in.

Want to know what's actually staining yours before you spend a Saturday on it? Get a free quote — we'll tell you which stains will lift and which won't, whether you're in Mobile, Saraland, or Theodore.