A concrete patio cleans up with a simple sweep, pre-wetting, a concrete-safe cleaner, stiff brushing, and a thorough rinse — the method depends on the stain type you’re facing.
For the full breakdown, see our best Cleaner For Cement Patio guide.
A grimy cement patio makes the whole yard look neglected. One afternoon with the right steps brings back the original surface without damaging the concrete. The process works for slabs, pavers, and similar hardscape surfaces, though indoor concrete needs different treatment. Here is how to handle routine grime and the tougher stains that set in over time.
Start by clearing the patio entirely. Move every piece of furniture, every planter, every grill. Sweep or blow away loose leaves, dirt, and dust — working cleaner into a layer of grit just creates muddy sludge. Hose down the surface to pre-wet the concrete; this keeps the cleaning solution from soaking in too fast and lets it work on the surface film.
Mix a mild cleaning solution. Warm water with a squirt of dish soap and a dash of degreaser handles most routine grime, or use a cleaner formulated for concrete. Apply the solution to one section at a time with a stiff-bristle brush or a long-handled scrub brush. Let it sit for about 2 to 5 minutes — never let it dry on the surface. Scrub in firm overlapping passes, then rinse thoroughly with a hose or pressure washer. Let the patio dry completely before returning anything to the surface.
Avoid metal-bristle brushes entirely. Wire bristles can leave tiny metal fragments lodged in the concrete pores, and those fragments rust over time into orange specks you will scrub forever. A stiff non-metal brush or a long-handled scrub brush does the job safely.
Handling Stubborn Stains: Mold, Oil, Rust, and Grease
For mildew, algae, or moss: mix one part white vinegar with two parts water in a spray bottle, wet the affected area, let it sit for 5 minutes, then scrub and rinse. The acidity kills surface growth without damaging the concrete.
For oil spills: act fast. Cover fresh oil with cat litter, sawdust, or baking soda to absorb the liquid, sweep it up after a few hours, then scrub the spot with a degreaser and rinse. Old oil stains may need a second treatment.
For rust or grease: sprinkle baking soda over the stain, spray with a vinegar-and-water mix until it fizzes, let it sit for 5 minutes, then scrub with a stiff brush. Lemon juice works well on rust too. For tougher grease marks, a concrete-safe degreaser from any hardware store is the right tool.
For general grime that resists soap: use a dedicated concrete and driveway cleaner. The official process calls for wetting the surface first, applying the cleaner at low pressure, letting it dwell for 3–5 minutes, then rinsing at high pressure while keeping the nozzle at least 2 feet from the surface and perpendicular to it. The manual method uses 1 measure of cleaner to 20 measures of water.
When and How to Use a Pressure Washer Safely
The safest approach uses the lowest effective pressure, a fan nozzle (never a zero-degree tip), and keeps the nozzle at least one foot from the surface; many experts recommend a full two feet during high-pressure rinsing. Test an inconspicuous corner first. A fan tip spreads the force rather than concentrating it into a groove that can etch the surface. If you see the concrete starting to pit or flake, back the pressure down or switch back to the hose.
After Cleaning: Drying and Sealing Decisions
Once the patio is clean and dry, consider applying a concrete sealer. A good sealer penetrates the surface and makes future cleaning dramatically easier — spills bead up instead of soaking in, and algae has a harder time gripping. Wait until the concrete is fully dry (at least 24 hours of good weather) before sealing. Test a small patch first to confirm the sealer does not darken the surface more than you want.
If you use bleach for a tough stain, wear protective gear and rinse thoroughly. Avoid letting any cleaner dry on the concrete before rinsing — dried cleaner leaves a white film that requires a second scrub. Protect nearby plants by spraying them with clean water before and after you clean; the overspray from cleaning mixtures can harm foliage. Muriatic acid is a last-resort option for deeply embedded stains, but it carries significant burn and damage risk and should only be used by someone experienced with handling strong acids.
FAQs
Can I use vinegar to clean my cement patio?
Yes. White vinegar mixed with water in a 1-to-2 ratio works well on mildew, algae, and light organic stains. It is safe for concrete and cheap, but it may not cut through grease or old oil — those need a degreaser.
How often should I clean a concrete patio?
Once or twice a year is enough for most patios. Spring cleaning removes winter grime and mold, and a fall cleaning clears leaves and debris before wet weather sets in. High-traffic areas near grills or fire pits may need a spot-clean between full sessions.
Will a power washer damage my concrete patio?
Only if misused. A pressure washer with a fan nozzle at low pressure and at least one foot of distance is safe. Using a narrow tip or getting too close can etch, pit, or chip the surface, especially on older concrete.
References & Sources
- Better Homes & Gardens. “How to Clean a Concrete Patio the Right Way.” Outlines the basic sweep-to-rinse sequence and common stain treatments.
- Simple Green. “How to Clean a Concrete Patio.” Details manual and pressure-washer application with dwell times and dilution ratios.
- Martha Stewart. “How to Clean Concrete Patios, According to Home Experts.” Covers safety precautions, stain-by-stain guidance, and drying steps.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.