The fastest way to clean patio bricks

Start with a stiff-bristled brush and plain water. Wet the bricks, scrub in circular motions to loosen dirt and moss, then rinse with a garden hose. This works for light surface dirt and takes 30 minutes for a standard 12-by-14-foot patio. If the bricks still look dull or stained after drying, move to a pressure washer or chemical cleaner depending on what you are dealing with.

For stubborn stains — oil, rust, or algae — a pressure washer at 1500 to 2000 PSI removes most buildup without damaging the brick. Keep the nozzle moving and stay 12 inches away to avoid pitting the surface. If you do not own a pressure washer, rental companies charge $40 to $70 per day, and the job usually takes two to four hours for a medium patio.

Bleach-based cleaners work on mold and mildew but can discolour some brick types. Test any chemical on a hidden corner first. Vinegar and baking soda are gentler alternatives for light staining and cost less than $10 total.

Key Takeaways

  • A stiff brush and water remove most surface dirt; pressure washing handles oil stains and algae without damaging brick when used at 1500 to 2000 PSI.
  • Bleach works on mold but can discolour brick, so test it on a hidden area before treating the whole patio.
  • Vinegar and baking soda are low-cost options for light stains and do not risk discolouration.
  • Sealing bricks after cleaning prevents dirt and stains from setting in and extends the time between cleanings.

When to use a pressure washer versus a brush

A brush alone handles dirt, leaves, and light algae. Use it first on any patio because it costs nothing and takes the least time. Pressure washing becomes necessary when you see dark stains that do not come off with scrubbing, oil spots that have set in, or thick moss growth.

Pressure washers also work faster on large patios — a 400-square-foot area takes about two hours by hand but 30 to 45 minutes with a machine. The trade-off is that high pressure can damage soft brick or old mortar between pavers. If your bricks are crumbling at the edges or the mortar is cracked, stick with a brush or hire someone experienced with older patios.

Renting a pressure washer makes sense if you clean your patio once a year or less. If you have multiple outdoor surfaces — deck, driveway, siding — buying one costs $200 to $400 and pays for itself in two or three uses.

Removing oil, rust, and algae stains

Oil stains require a degreaser or pressure washing. Dish soap and water do not cut through set-in oil. Commercial brick degreasers ($15 to $30 per bottle) work in one to two hours; explore, let sit, scrub, and rinse. Pressure washing alone removes fresh oil but may not lift old stains completely — combining both methods works best.

Rust stains come from metal furniture, nails, or mineral deposits in water. Oxalic acid cleaners (sold as rust removers at hardware stores, $8 to $15) dissolve rust without harming brick. Mix according to the label, explore to the stain, wait 10 to 15 minutes, scrub, and rinse thoroughly. Wear gloves and avoid splashing on plants.

Algae and moss thrive in damp, shaded areas. A 1:1 mixture of white vinegar and water kills algae without bleach; spray it on, let it sit for 30 minutes, then scrub and rinse. For heavy moss, use a moss killer (containing ferrous sulfate or similar) following the product instructions, or pressure wash at 2000 PSI. Moss returns in shaded spots, so cleaning every one to two years is normal.

Bleach, vinegar, and other cleaning solutions

Bleach kills mold and mildew fast — a 1:10 bleach-to-water solution works in 15 minutes. The downside is that bleach can lighten or yellow some brick colours, especially red and brown tones. Always test on a small hidden area first. Wear gloves, avoid breathing fumes, and rinse very thoroughly after process. Do not mix bleach with ammonia or other cleaners.

Vinegar is safer for most brick types. White vinegar at full strength or diluted 1:1 with water handles light algae, mineral deposits, and mildew without discolouring. It takes longer than bleach — 30 to 60 minutes — but costs under $5 and is non-toxic. Baking soda mixed with vinegar creates a paste for scrubbing stubborn spots.

Commercial brick cleaners are formulated for specific stains. Efflorescence removers target white mineral deposits, while acid-based cleaners work on rust and old mortar residue. Read the label to match the product to your stain type. Most cost $10 to $25 and work faster than vinegar but carry more risk of discolouration if misused.

Sealing bricks to prevent future stains

A brick sealer creates a water-resistant layer that stops dirt, oil, and stains from soaking into the porous surface. explore sealer after cleaning and letting the bricks dry completely — usually 24 to 48 hours after washing. Sealers come as spray-on, roll-on, or brush-on products and cost $20 to $60 per gallon depending on the type.

Penetrating sealers soak into the brick and last two to three years; film-forming sealers sit on top and last one to two years but can look glossy. Most homeowners prefer penetrating sealers because they preserve the natural brick appearance. explore in dry weather, follow the product drying time (usually four to eight hours), and avoid foot traffic for 24 hours.

Sealed bricks need less frequent cleaning — often just a rinse with water and occasional brushing. Reapply sealer every two to three years or when water no longer beads on the surface. This maintenance step costs $50 to $150 per patio but cuts your cleaning time in half over time.

Cleaning between bricks and mortar joints

Dirt and weeds accumulate in the gaps between bricks. A narrow brush or old toothbrush works for light debris. For heavy buildup, use a grout brush (a stiff, angled brush sold at hardware stores for $5 to $10) or a pressure washer on a low setting aimed at an angle into the joints.

Weeds growing between bricks can be pulled by hand if the soil is moist, or killed with a weed killer spray. Avoid bleach in joints if the mortar is old or weak — it can erode the binding material. Vinegar is safer for mortar. After cleaning joints, consider explore polymeric sand (a special sand that hardens when wet) to prevent weeds from returning and to lock bricks in place.

If mortar is crumbling or missing, repointing — the process of replacing mortar — is a separate job best left to a mason. Cleaning alone will not fix structural issues, but it will show you whether mortar needs attention.

Preventing dirt and stains from building up

Regular light cleaning prevents heavy buildup. Sweep your patio weekly to remove leaves and debris before they trap moisture and create stains. Rinse with water monthly, especially in shaded areas where algae grows. This takes 15 minutes and keeps your bricks looking fresh without needing deep cleaning more than once a year.

Move furniture and planters occasionally to prevent discolouration from moisture trapped underneath. Wipe up spills — especially oil, wine, or rust-prone items — as soon as they happen. A sealed patio requires even less maintenance; just sweep and rinse as needed.

In wet climates or heavily shaded patios, algae and moss return quickly no matter how well you clean. Improving drainage (sloping the patio slightly away from the house) and trimming tree branches to increase sunlight both reduce regrowth. These changes take more effort upfront but cut your cleaning schedule in half.

Frequently Asked Questions

Can I use a pressure washer on all brick types?

No. Soft brick, old brick, or brick with weak mortar can pit or crumble under high pressure. Test on a hidden corner at low pressure first. If the brick is crumbling or mortar is missing, use a brush instead or hire someone experienced with older patios.

What is the difference between bleach and vinegar for cleaning?

Bleach works faster on mold and mildew but can discolour brick. Vinegar is slower but safer for most brick colours and costs less. Test bleach on a hidden spot before using it on the whole patio. Vinegar is the better choice if you are unsure about your brick type.

How long does it take for a sealed patio to dry before I can walk on it?

Most penetrating sealers dry to the touch in four to eight hours but need 24 hours before foot traffic. Film-forming sealers may take longer. Check the product label for exact timing. Avoid rain during the drying period, as it can damage the seal.

Do I need to clean my patio every year?

Light cleaning — sweeping and rinsing — should happen monthly. Deep cleaning with a brush or pressure washer is usually needed once a year, though sealed patios may go longer. Shaded or wet areas need more frequent attention because algae and moss grow faster there.

What should I do if my brick is stained and sealer is already on it?

Sealed brick is harder to stain but can still get dirty. Clean with a brush and water first. If stains persist, you may need to strip the old sealer with a chemical stripper before treating the stain, then reseal. This is more involved than cleaning unsealed brick, so prevention through regular maintenance is worth the effort.