A driveway is the largest exposed concrete surface on most homes, and it absorbs everything: tire rubber, motor oil, leaf tannin, algae spores, mildew, road salt, and bird waste. After 18 to 36 months, the surface goes from clean gray to a streaked patchwork of stains. The right cleaner is not a single product, it is the chemistry matched to the dominant contamination. After looking at 16 current driveway-rated cleaners across degreaser, algae killer, and general-purpose categories, these five stood out for cleaning power, dwell time, landscape safety, and how they handle different stain types.
Quick comparison
| Cleaner | Type | Coverage | Best for |
|---|---|---|---|
| Krud Kutter Concrete and Driveway Cleaner | Degreaser | 500 sq ft/gal | Oil, tire marks |
| Wet and Forget Outdoor | Biocide | 1500 sq ft/gal | Algae, mildew |
| ZEP Driveway and Concrete Cleaner | Degreaser plus surfactant | 600 sq ft/gal | General grime |
| 30 Seconds Outdoor Cleaner | Sodium hypochlorite | 750 sq ft/gal | Fast biological |
| Behr Concrete and Masonry Cleaner | Phosphoric acid | 200 sq ft/gal | Etch plus clean |
Krud Kutter Concrete and Driveway Cleaner, Best Overall
Krud Kutter Concrete and Driveway Cleaner is a non-toxic, water-based degreaser that handles the most common driveway problem: oil drips, tire marks, and general embedded grime. The formulation is biodegradable and safer for landscape runoff than acid or bleach cleaners.
For a typical residential driveway with mixed contamination, this is the practical default. Apply with a pump sprayer at the recommended 1:4 dilution, scrub with a stiff push broom, let dwell 5 to 10 minutes, then rinse with a garden hose or pressure washer. Two passes handle moderate buildup; severe oil stains may need spot treatment with a stronger degreaser.
Trade-off: weaker on biological growth than dedicated algae killers. For a driveway in heavy shade with green or black streaking, pair this with Wet and Forget for two-step treatment.
Wet and Forget Outdoor, Best For Algae And Mildew
Wet and Forget is the right answer for green, gray, or black biological staining on a shaded driveway. The formulation is a slow-acting biocide that kills algae, lichen, mold, and mildew without bleach. Apply once, then walk away; the product works over several weeks with rainfall and sunlight doing the rinse work.
For homes in humid climates or under tree cover, this prevents the buildup that otherwise requires aggressive pressure washing. Spray on a dry surface in mild weather (50 to 90 degrees, no rain forecast for 4 to 6 hours), and the treatment lasts 12 to 18 months.
Trade-off: not a degreaser. Will not touch oil stains, tire marks, or embedded petroleum grime. Use this for biological cleaning only and pair with Krud Kutter for full driveway maintenance.
ZEP Driveway and Concrete Cleaner, Best Value Multi-Purpose
ZEP Driveway and Concrete Cleaner is a stronger commercial-grade formulation than typical retail products, sold at competitive pricing through home improvement retailers. The combination of surfactants and degreasers handles most general grime in a single pass.
For users who want one product that handles everything short of severe oil staining and heavy algae, this covers the range. Coverage is roughly 600 square feet per gallon at full strength, more at dilution.
Trade-off: stronger formulation means more aggressive on landscaping runoff. Rinse plants and lawn with clean water immediately after cleaning if runoff cannot be controlled. Wear nitrile gloves; the cleaner is rough on skin.
30 Seconds Outdoor Cleaner, Best Fast Action
30 Seconds Outdoor Cleaner is a sodium hypochlorite-based formulation that produces visible results within minutes on biological staining. For a driveway with green algae or black mildew that needs to look clean before a weekend gathering, this delivers the fast result.
Spray on, wait 5 to 10 minutes, and the biological staining is visibly knocked down. A garden hose rinse completes the job.
Trade-off: kills plants on contact, including grass at the driveway edge. Plan for protection: pre-wet adjacent vegetation, cover with plastic sheeting, or accept that a strip of grass along the driveway will brown. Also strips color from old asphalt sealcoat and stains clothing instantly, so wear old clothes.
Behr Concrete and Masonry Cleaner, Best For Pre-Seal Prep
Behr Concrete and Masonry Cleaner is a phosphoric acid product designed for the pre-seal preparation step: open the pore structure of the concrete, remove efflorescence and surface laitance, and produce a slightly etched surface that grips sealer or paint.
For users who plan to seal or coat a driveway after cleaning, this is the right pick for the cleaning step. Apply with a pump sprayer, scrub with an acid-resistant broom, dwell 5 to 10 minutes, neutralize with a baking soda solution rinse, then clean water rinse.
Trade-off: acid product requires careful handling and full PPE (gloves, eye protection, ventilation). Will etch glass, stainless steel, and aluminum on contact. Only use this when sealing or coating is the next step; for routine cleaning, the milder products above are appropriate.
How to choose
Diagnose the dominant stain before buying
A driveway with oil drips needs a degreaser. A driveway with green algae needs a biocide. A driveway with white efflorescence needs an acid cleaner. Buying a general-purpose cleaner for a specific severe stain produces a mediocre result. Walk the driveway, identify what you see (oil, biological, mineral), and match the chemistry.
Apply chemistry before pressure
The mistake DIY users make most often is reaching for the pressure washer first. Water under pressure pushes contamination deeper and can etch the concrete surface. The correct sequence is: dry sweep, apply chemical cleaner, let dwell, scrub with a stiff broom, then rinse. The pressure washer is the rinse tool, not the cleaning tool.
Protect what is downhill
Driveway runoff goes somewhere: lawn, garden bed, storm drain, or street. Identify the path before you start and protect what matters. Pre-wet lawn and plants with clean water (this dilutes any cleaner that reaches them), cover sensitive plants with plastic, and divert runoff away from storm drains during chemical cleaning if local regulations apply.
Two thin treatments beat one strong one
Aggressive chemistry on the first pass produces a uniformly cleaner driveway, but it also strips more concrete laitance and can leave a chalky appearance. Two moderate treatments with a few days between produce a deeper clean without the chalky residue. Patience pays.
For follow-up sealing after cleaning, see our breakdown of acrylic concrete sealers and our writeup on stained vs painted concrete. For the testing protocol we apply to outdoor cleaning products, see our methodology page.
For most driveways, Krud Kutter covers the routine cleaning need at moderate cost. For biological contamination, Wet and Forget is the defensible long-term pick. For pre-seal preparation, Behr Concrete and Masonry Cleaner is the right tool. Match the chemistry to the stain, mind the runoff, and the driveway comes back to clean gray.
Frequently asked questions
Do I need a pressure washer to clean a concrete driveway?+
Not necessarily. For routine cleaning, a garden hose with a high-pressure nozzle and a stiff push broom handles most jobs when paired with a chemical cleaner that does the actual work. A pressure washer speeds things up and helps with embedded grime, but applying the wrong tip too close to the surface can etch the concrete and create permanent marks. For most homeowners, chemistry plus brushing covers the routine job; rent a pressure washer for the once-a-year deep clean.
Will driveway cleaner damage my lawn or plants?+
Some will, some will not. Sodium hydroxide cleaners (lye-based) burn grass and acidify soil; rinse runoff thoroughly and cover sensitive plants. Oxygen bleach (sodium percarbonate) breaks down into water, oxygen, and soda ash, which are landscape-safe in normal concentrations. Hypochlorite bleach kills plants on contact. The label tells you the active ingredient; choose based on what is downhill of your driveway.
How often should I clean my driveway?+
A quick rinse and broom every 2 to 3 months prevents most buildup. A deeper chemical cleaning once or twice a year handles algae, mildew, and embedded grime. Aged concrete benefits from a real cleaning before sealing, which most driveways need every 2 to 4 years. For homes near trees, expect more frequent cleaning due to leaf tannin staining and biological growth.
What is the white haze on my driveway after cleaning?+
Efflorescence, the migration of calcium hydroxide from inside the concrete to the surface. Cleaning with water draws it out, and as the water evaporates it leaves a white crystalline residue. The fix is an efflorescence remover (a mild acid product) or muriatic acid diluted to 10 percent strength. Always neutralize with baking soda solution after acid cleaning to prevent etching.
Can I use bleach to clean my driveway?+
Sodium hypochlorite (household bleach) kills algae and mildew effectively at 1:10 dilution, but it kills landscape plants on contact and degrades quickly in sunlight. For algae and mildew alone, oxygen bleach (sodium percarbonate) is the better choice; it is more stable, less reactive with plants, and breaks down into harmless components. For oil stains and embedded grime, neither bleach is appropriate; use a degreaser instead.
