Hiring a pressure washer from a local store can make a patio look better for a weekend, but professional cleaning reaches a different level — and lasts a lot longer. Here's what the process actually removes.
Algae and green growth
The green film that makes patios slippery is algae. Domestic washers blast the surface but rarely treat the spores, so it returns within weeks. We combine controlled pressure with the right treatment so the clean holds.
Black spot lichen
Those stubborn black dots are lichen, and they bond tightly to stone. They won't shift with a garden hose and often survive a domestic jet wash. Professional treatment breaks them down properly.
Moss, weeds and joint debris
Moss between slabs traps water and lifts jointing over time. We clear the growth, flush the joints and leave the surface ready for fresh sand or pointing where needed.
Why the finish lasts
It isn't just about pressure. Surface type, nozzle choice, technique and aftercare all matter. Getting those right is the difference between a patio that looks good for a season and one that stays clean for years.