How to remove oil stains from a concrete driveway in Tallahassee - why degreaser and not bleach is the answer, the poultice method for set-in stains, what a pressure washer can and cannot do, and how much of the stain realistically comes out.
The short version: an oil stain is not sitting on your driveway, it is soaked into it. Concrete is porous, so motor oil wicks down into the slab and no amount of pressure will blast out what is already below the surface. What works is an alkaline degreaser that breaks the oil into something water can carry, left to dwell, agitated with a stiff brush, then rinsed with hot water. Old stains need a poultice that pulls oil back up as it dries. Expect a fresh spill to disappear entirely and a two-year-old stain to lighten by most of the way, not all of it.
Two things about the Big Bend work against you here. The first is heat. A bare concrete driveway in Killearn or Southwood in July sits well above air temperature by mid-afternoon, and warm oil is thinner oil. A drip that would sit on the surface of a cool slab in February soaks in noticeably deeper on a 95-degree August day, which is why the stain that appeared in summer is usually the stubborn one. The second is our rain. Sixty-plus inches a year keeps the slab damp, and a damp slab does not want to accept the degreaser you are trying to drive into it.
There is also a local complication that catches people out. Around here, a dark patch on concrete is far more often canopy growth or leaf tannin than it is oil. Under live oaks in Betton Hills or Myers Park, algae, mildew, and the brown bleed from wet leaves all show up as dark staining, and they respond to completely different chemistry. Before you buy degreaser, be sure you are actually looking at oil: oil stains sit where a vehicle parks, have a soft irregular edge, and often show a faint rainbow sheen when wet. If the darkening follows the drip line of a tree or the path where leaves pile up, you are looking at tannin staining instead.
This is the single most common wasted afternoon we see in Tallahassee, and it is an understandable mistake. Almost every other stain on a North Florida driveway is biological, and a diluted bleach solution genuinely does handle those. So homeowners reach for the same jug, apply it to an oil spot, and watch nothing happen.
The reason is straightforward chemistry. Sodium hypochlorite kills living growth by oxidizing it. Motor oil is not alive, and it is not water-soluble either, so there is nothing for the bleach to attack and no way for water to carry it off. What you need is a surfactant-based degreaser that surrounds oil droplets and holds them in suspension so a rinse can lift them out of the pores. That is a different product on a different shelf, and using the right one is most of the job.
If the oil is still wet, do not rinse it and do not scrub it yet. Both of those spread the spill outward and push it deeper. Cover the whole area generously with a dry absorbent instead. Cheap clay cat litter works, so does the oil-dry sold at any auto parts counter on Apalachee Parkway, and in a pinch cornmeal or sawdust will do. Let it sit for several hours, ideally overnight, then sweep it up and bag it.
Only then apply degreaser to what is left. On a same-day spill treated this way, the stain usually comes out completely, which is a very different outcome from the same spill discovered a month later. If you take one thing from this page: the absorbent step is the cheapest and highest-return part of the entire process, and it only exists in the first day.
For a stain that has been there weeks or months, work in this order. Sweep the area clean and dry, because grit and damp both dilute what you are about to apply. Pick a day that is not about to rain, which in a Tallahassee summer usually means a morning rather than an afternoon.
Apply a concentrated alkaline degreaser directly to the dry stain, undiluted or close to it, and give it real dwell time. Ten to fifteen minutes is a reasonable target, and the enemy is evaporation, so on a hot slab mist the area lightly to keep it wet rather than letting it flash off. Then agitate with a stiff-bristle deck brush, working in two directions rather than one. Rinse with the hottest water you can reasonably deliver.
Then look at it while it is still wet, judge, and repeat. Two or three moderate cycles almost always beat one aggressive attempt, because each pass pulls another layer of oil out of the pore structure. This is slow, unglamorous work, and it is the part most people quit halfway through.
When a stain is years old and the degreaser has stopped making progress, the oil that remains is too deep for a surface treatment to reach. A poultice reverses the direction of travel: instead of pushing cleaner down, it pulls oil up.
Mix an absorbent powder with a solvent into a paste roughly the thickness of peanut butter. Diatomaceous earth or plain baking soda both work as the absorbent. Spread the paste over the stain about a quarter of an inch thick, extending an inch past the visible edge, and cover it with plastic taped down at the perimeter. Leave it for a day, then remove the plastic and let the paste dry out completely, which is the step that actually does the work: as the solvent evaporates it carries dissolved oil up into the drying powder. Scrape off the crust, sweep, and rinse.
One poultice cycle on a genuinely old stain typically produces a visible improvement rather than a finish. Two or three cycles are normal, and each one takes a couple of days, so this is a project you start on a Saturday and check on during the week.
A pressure washer is a rinse tool in this job, not the cleaning agent. Its value is that it delivers hot water and mechanical force to flush loosened oil out of the pores after the degreaser has done its work, and a flat surface cleaner attachment does that evenly across the whole slab instead of leaving the tiger stripes a bare wand leaves behind.
What it will not do is remove oil on its own. Pointing a narrow tip at a stain and holding it there does not extract oil, it erodes the cement paste around the aggregate until the spot looks lighter because you have removed a layer of concrete. That damage is permanent and it is obvious in raking afternoon light. The same restraint that applies to a shaded patio slab applies here: let the chemistry work and use water to carry the result away. It is the same principle behind soft washing a house, applied to a horizontal surface.
Check whether your driveway is sealed before you start, because it changes both the method and the outcome. Flick a few drops of water onto a clean part of the slab. If they bead and sit, there is a sealer on it. If they darken the concrete and soak in within seconds, the slab is bare.
On sealed concrete the news is good and the method is gentler. Oil mostly sits on the sealer rather than in the slab, so it wipes and washes off with far less effort, and a strong alkaline degreaser is unnecessary and can cloud the finish. On bare concrete, which is most driveways in the older parts of town, the oil is in the pores and you are committed to the full dwell-agitate-rinse process. Newer slabs in the Ox Bottom and Bradfordville subdivisions are more likely to have been sealed at some point, but sealer wears off in traffic lanes, so it is common to find a driveway that is sealed at the edges and bare where the tires run.
People describe all of them as an oil stain, but they behave differently. Motor oil is the ordinary case and responds well to the process above. Transmission and power steering fluid are dyed red, and that dye can leave a pink shadow in the concrete long after the oil itself is gone, which is a staining problem rather than a grease problem and often does not fully clear.
Hydraulic fluid from a trailer jack or a lift is thinner and travels further into the slab than motor oil, so it usually needs the poultice from the start rather than as a fallback. And a black stain under an older vehicle is sometimes not oil at all but a rust bleed from a leaking component, which needs an oxalic-based treatment instead. That is the same chemistry as the red clay and rust staining common on driveways out toward Havana and Quincy, and using degreaser on it will get you nowhere.
Do not use gasoline, kerosene, mineral spirits, or paint thinner as a driveway cleaner. They do dissolve oil, which is why the advice circulates, but they are a fire hazard on a hot slab, they drive dissolved oil deeper into the concrete rather than lifting it, and the residue keeps attracting dirt for months afterward. The poultice method uses a solvent for a reason, and the reason is that the paste holds it in place and traps what it dissolves.
Do not use muriatic acid either. It etches the surface, and while an etched patch looks lighter at first, it weathers differently from the concrete around it and will stand out permanently. And skip the wire brush: steel bristles break off, embed in the slab, and rust into a fresh set of orange freckles within a few weeks in our humidity. A stiff synthetic bristle brush costs less and does the job better.
This is where honest expectations matter more than technique. A spill treated within a day comes out completely. A stain a few weeks old comes out almost completely, with maybe a faint shadow visible when the concrete is wet. A stain that has been there for years lightens substantially and usually leaves a permanent ghost, because oil that has migrated deep into the slab is not coming back up through a poured surface.
The practical test is whether the spot still reads as a stain from the street. Getting a black blotch down to a faint discoloration you only notice when you look for it is a realistic and worthwhile outcome. Chasing the last ten percent with progressively harsher methods is how driveways get etched, and an etched patch is more visible than the stain it replaced. There is also an honest cosmetic point: cleaning a stain in isolation often makes the surrounding driveway look dirtier by contrast, so the whole slab usually needs washing to look right.
Worth thinking about before you start. Driveway runoff in Tallahassee generally enters the city storm drain system, which discharges to local waterways rather than to a treatment plant, so oily wash water genuinely should not be flushed straight down the slope into the street. The absorbent step at the start is the main defense here: sweeping up saturated litter and bagging it removes the bulk of the oil as solid waste before any water is involved.
Beyond that, keep rinse volumes modest, direct the flow onto grass or a mulched bed where soil can filter it rather than down the driveway apron, and never rinse a poultice residue into the gutter. Professional crews doing commercial work manage this with containment mats and vacuum recovery, but for a homeowner cleaning one stain, absorb first and rinse onto vegetation covers the substance of it.
Most Tallahassee homeowners do not hire someone for a single oil spot, because the labor to set up is the same whether you treat one stain or clean the whole driveway. Spot oil treatment is normally an add-on to a driveway cleaning rather than a standalone visit, and it usually adds a modest amount to the job rather than doubling it, depending on how many stains there are and how deep they have gone.
A full driveway cleaning in the Tallahassee area typically runs in the low hundreds for a standard two-car drive, with the exact figure depending on square footage, access, and how much growth is on the slab. Our driveway pressure washing cost page breaks the pricing down properly, and the broader pressure washing cost page covers how exterior work is priced across the Big Bend. Ask up front whether oil treatment is included, because it is genuinely extra work and a quote that does not mention it probably has not accounted for it.
The durable answer is to fix the leak, since a drip pan under a vehicle that leaks steadily just relocates the problem. Short of that, a garage floor mat or a purpose-made drip tray under the parking spot catches almost everything and costs less than one professional cleaning.
Sealing the driveway is the other real preventive step. A penetrating sealer on bare concrete gives oil somewhere to sit rather than somewhere to soak, and it makes every future spill a wipe-up rather than a project. It also helps with the mildew and tannin staining that our canopy produces year-round. Resealing is periodic maintenance rather than a permanent fix, and traffic lanes wear first, but on a driveway that regularly sees vehicle drips it pays for itself in avoided scrubbing.
Does Dawn dish soap remove oil stains from concrete? It helps on a fresh, light spill because it is a surfactant, which is the right general category. On a set-in stain it is too weak and too dilute to reach oil that is already in the pores. Use it if it is what you have on hand within the first day, but do not expect it to solve an old stain.
Will the stain come back after I clean it? Sometimes, and it is not your imagination. Oil deep in the slab can migrate back toward the surface over the following weeks, especially in hot weather. If a faint stain reappears a month later, another degreaser cycle usually finishes it, and the second round is far easier than the first.
Can I clean an oil stain in the rain? No. Degreaser needs to reach dry concrete and stay in contact with it, and a wet slab both dilutes the product and blocks it from penetrating. Wait for the driveway to dry fully, which after a Tallahassee downpour can mean a day in a shaded spot.
Is a hot water pressure washer worth it for oil? It makes a real difference, which is why commercial crews use them. Hot water thins the oil and keeps the degreaser active, and the combination lifts noticeably more than cold water does. For a homeowner with a cold-water machine, longer dwell and more cycles substitute for the heat reasonably well.
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