Pressure washing guide
How to pressure wash concrete
Concrete driveways, paths and patios are among the most satisfying surfaces to pressure wash. Dense and durable, concrete handles high pressure well and a thorough clean can transform the appearance of the whole property.
Concrete is one of the most forgiving surfaces to pressure wash. It is dense, non-porous compared to natural stone, and handles the high pressures needed to shift deep staining, algae and embedded pollution without surface damage in most cases. A thorough pressure wash can make an old, stained concrete driveway or path look close to new and the process is more straightforward than with other surface types.
2,500 to 3,000
PSI is the effective range for cleaning concrete driveways and paths without surface damage
Surface cleaner
attachment is highly recommended for large concrete areas for even coverage and no stripe marks
Degreaser
essential pre-treatment for oil stains on concrete, which pressure alone cannot lift without prior chemical treatment
How to pressure wash concrete: step by step
Step 1: Prepare the surface
Remove all vehicles, furniture and items. Sweep away loose debris. Pre-treat any oil stains with a degreaser and leave for at least 20 minutes. Oil that is not pre-treated will be spread across the surface during washing rather than removed.
Step 2: Select the correct nozzle
Use a 25-degree fan nozzle for general concrete cleaning, or a surface cleaner attachment for large driveways. A surface cleaner provides even coverage and eliminates the stripe pattern that a hand wand can leave on large flat areas. Never use a 0-degree pencil jet on concrete — it will etch the surface permanently.
Step 3: Apply cleaning solution for heavy soiling
For severely stained or long-neglected concrete, apply a biodegradable concrete cleaner or degreaser before pressure washing. Allow it to dwell for 5 to 10 minutes then wash off. For regular maintenance cleaning, water pressure alone is generally sufficient.
Step 4: Work from the highest point downwards
Start at the top of the slope and work downwards so dirty water runs away from cleaned areas. Work in overlapping horizontal passes using a continuous sweeping motion. Maintain a consistent distance of 30 to 50 cm from the surface.
Step 5: Final rinse and inspection
Complete with a full final rinse to remove remaining dirty water and cleaning product residue. Check for any missed patches, particularly around drains and edges, and re-clean as needed.
How to remove oil stains from concrete
Oil stains are the most common challenge on concrete driveways in London, where parked vehicles, delivery access and road runoff all contribute to hydrocarbon contamination. Pressure washing alone spreads the oil rather than removing it. The correct approach is to apply a specialist alkaline degreaser, leave it to break down the oil, and then pressure wash off. For very deep or long-established stains, a second application may be needed. Hot water pressure washing is significantly more effective on oil than cold water and is the preferred professional method.
Fresh oil stains
Apply soda crystals or cat litter immediately to absorb surface oil. Sweep up then treat with degreaser before pressure washing.
Old or deep oil stains
Apply a commercial alkaline degreaser, allow 30 minutes dwell, agitate with a stiff brush, then pressure wash with hot water for best results.
Professional pressure washing London
Concrete cleaning across London by Cloud Nine
Cloud Nine cleans concrete driveways, paths and patios across London using commercial equipment including hot water capability for oil stain removal. Contact us for a free no-obligation quote.
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Pressure washing help and guidance
Everything you need to know about pressure washing for London homes and businesses, from surface types to costs and what to expect from a professional clean.
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