Patio cleaning process
What Should I Expect from a Patio Washing Service?
A patio washing service clears furniture and debris, pre-treats any tough stains, then systematically cleans the surface with pressure matched to the patio material — concrete gets 2,000 to 3,000 PSI, pavers and natural stone get 1,200 to 2,000 PSI. The whole job takes 30 to 90 minutes for most residential patios. You’ll keep off the surface for 2 to 4 hours afterward while it dries.
Patios in Northern Virginia deal with a specific combination of conditions: humid summers that encourage algae and mildew growth, heavy spring pollen, clay-heavy soil that tracks onto surfaces, and the occasional freeze-thaw winter that works grime into surface pores. A professional wash clears all of that in a single visit. If you haven’t scheduled one before, this page breaks down exactly what happens during the service and what to expect from the results.
What does a patio washing crew actually do?
The crew walks the patio, identifies the surface material and any problem spots like stains or heavy algae growth, then sets up equipment. They move or work around furniture (homeowners often move furniture beforehand to speed the job), apply any pre-treatment needed on stains, clean the surface with pressure matched to the material, and do a final rinse to clear debris from the surrounding area.
Most patio washing visits follow the same general sequence:
- Walk and assess — Crew identifies surface type, staining, and any fragile areas like loose grout or cracked pavers
- Clear the work area — Move small furniture, potted plants, and items off the patio; rinse surrounding landscaping
- Pre-treat problem areas — Apply degreaser to oil stains, biological treatment to heavy algae sections if needed
- Wash the surface — Systematic cleaning with pressure and tip appropriate to the material
- Final rinse — Clear dislodged debris and rinse runoff from surrounding areas, especially plants and grass
- Walk the patio with the homeowner — Confirm results, note any stains that may need follow-up
How long does a patio wash take?
Most residential patios in Northern Virginia take 30 to 90 minutes depending on size and surface condition. A standard 300 to 400 square foot concrete patio in average condition takes about 30 to 45 minutes. A larger patio with pavers, problem staining, or areas needing pre-treatment takes closer to 60 to 90 minutes. Add time if furniture removal is part of the service.
The surface condition is the biggest variable. A patio that’s been washed within the last year and has light soiling goes quickly. One that hasn’t been cleaned in three or four years and has significant algae, moss, or staining in the grout lines takes longer. Paver patios with sand-filled joints also take more care than flat concrete — too much pressure in a single spot can displace the joint sand.
What pressure and method is used for different patio surfaces?
Concrete patios handle 2,000 to 3,000 PSI with a surface cleaner for even results. Brick or concrete pavers need 1,200 to 2,000 PSI with a 40-degree tip to avoid disturbing joint sand. Natural stone like bluestone, flagstone, or travertine needs the lowest pressure — 800 to 1,500 PSI — with care around any veining, porous sections, or existing cracks. Composite patio materials are cleaned at 1,000 to 1,500 PSI.
| Patio surface | PSI range | Tip / attachment | Key consideration |
|---|---|---|---|
| Poured concrete | 2,000–3,000 PSI | Surface cleaner or 25-degree | Watch for existing cracks |
| Brick or concrete pavers | 1,200–2,000 PSI | 40-degree fan tip | Avoid displacing joint sand |
| Natural stone (bluestone, flagstone) | 800–1,500 PSI | 40-degree fan tip | Softer stone; avoid acid cleaners |
| Travertine or tumbled stone | 600–1,000 PSI | 40-degree, held back | Highly porous; very gentle approach |
| Composite patio material | 1,000–1,500 PSI | 40-degree fan tip | Work with the grain direction |
What results should you expect?
A professional patio wash removes the algae, mildew, pollen film, and general surface grime that accumulates on outdoor hardscaping. The patio will look noticeably brighter and cleaner immediately. Some stains — old oil, embedded rust, very old organic staining — may not lift completely with water pressure alone and require a chemical pre-treatment or a follow-up visit.
Most homeowners are genuinely surprised at how much cleaner the patio looks after a professional wash compared to a DIY rinse with a garden hose. The pollen film that looks like a faint haze lifts completely. The dark green algae streaks in the grout lines disappear. The overall surface color comes back to what it looked like when it was newer. Even a patio that hasn’t been washed in several years typically cleans up very well in a single service visit.
The exceptions are stains that have been present long enough to penetrate deep into the surface. Old motor oil that sat on a concrete patio for months, rust from metal furniture left in standing water, and tannin staining from prolonged leaf contact can all go deep enough that pressure alone doesn’t reach them. A pre-treatment chemical applied before the wash typically handles these — the crew will let you know beforehand if any spot appears to need extra attention.
Ready to see your patio looking clean again?
Diamond Power Washers handles concrete, paver, natural stone, and composite patios across Fairfax, Manassas, Woodbridge, Chantilly, and all of Northern Virginia. Surface-safe methods and a 100% Satisfaction Guarantee.
Frequently asked questions
What does a patio washing service include?
A patio washing service typically includes a walk-around assessment of the surface condition, pre-treatment of any problem stains, systematic pressure washing of the patio surface at the correct PSI for the material, and a final rinse to clear debris. Most crews move small furniture and pot plants before washing if you haven’t already done so, and do a final walkthrough with you to confirm the results.
How long does a patio washing service take?
Most residential patios in Northern Virginia take 30 to 90 minutes. A standard concrete patio in decent condition takes 30 to 45 minutes. Larger patios, paver surfaces with detailed joint work, or areas with heavy staining or algae take 60 to 90 minutes. The crew will give you a realistic time estimate when they assess the work area.
Do I need to be home during the patio washing service?
Not necessarily. As long as the crew can access the patio and any water connection they need, the job can proceed without you present. It’s helpful to be available at the start so the crew can ask about any specific areas of concern, and at the end to confirm the results look right to you. If you won’t be home, note any stains or problem areas in advance so the crew knows to give them attention.
How do I prepare for a patio washing service?
Move outdoor furniture, potted plants, and any items on the patio before the crew arrives — this speeds the job and keeps items from getting wet. If you have gas or propane connections on the patio (a grill or outdoor heater), make sure they’re closed and note their locations. Cushions and fabric items should be taken inside. The crew handles everything else from there.
Will patio washing damage my plants or surrounding lawn?
A professional crew rinses surrounding vegetation before and after washing to dilute any runoff. Healthy established grass and plants adjacent to a patio tolerate a water-only pressure wash without damage. If any cleaning chemical is used on the patio surface, the crew pre-rinses adjacent plants and rinses again afterward. Delicate plants close to the patio edge are better moved temporarily before the wash.
Can patio washing remove moss and algae from between paver joints?
Yes. Pressure washing removes biological growth from paver joints effectively. The consideration for pavers is keeping the pressure appropriate — high enough to clear the growth but not so high that it displaces the joint sand. A 40-degree tip at 1,200 to 2,000 PSI handles most paver joint cleaning without disturbing the sand base significantly. After washing, some sand displacement is normal and can be topped off with fresh polymeric sand.
What should I do after my patio is washed?
Keep foot traffic off for 2 to 4 hours while the surface dries. Walk the patio once it’s dry to check the results and note any stains the crew mentioned. If you’re planning to seal the surface, allow 48 to 72 hours for concrete or pavers to dry fully before applying sealer. Bring furniture back once the surface is fully dry, usually 2 to 4 hours in summer conditions.
How often should I get my patio washed in Northern Virginia?
Most Northern Virginia patios benefit from an annual wash. The spring pollen season leaves a thick film on patio surfaces by May, and the summer humidity encourages algae and mildew growth through the warm months. An annual wash timed before summer entertaining season — typically April through June — keeps the surface at its best. Patios in heavy shade or near mature trees may need washing twice a year due to faster biological growth.
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