Straight answers from the people who do this every day.
Professional driveway cleaning in the UK typically costs £120,£280 for a standard semi-detached home, £280,£550 for a large detached driveway. Full price breakdown by surface and size.
Roof moss should be removed using soft-wash biocide treatment, never high-pressure water. Hand-scrape the heaviest growth, apply a sodium hypochlorite-based wash at low pressure, and the spores die at root. The roof returns to original colour over the following weeks.
Clean block paving by pre-treating algae with a biocide, then using a flat rotary surface cleaner at controlled pressure, never a narrow lance. Re-sand the joints with kiln-dried sand afterwards to lock the surface and slow weed regrowth.
Pressure washing uses water force to lift dirt, right for hard surfaces like driveways, patios and walls. Soft washing uses biocide at very low pressure, essential for roofs, render, painted walls and anything with a finish coating. Using the wrong method causes permanent damage.
Clean K-Rend and modern thin-coat render using soft-wash methods only, apply a sodium hypochlorite biocide at low pressure, let it dwell 20,40 minutes, then rinse with pure water at low pressure. Pressure washing K-Rend strips the silicone finish and opens the surface to water damage.
Most UK homes need their gutters cleaned once a year, typically late autumn after leaf fall. Properties with overhanging trees, moss-shedding tile roofs, or three or more storeys benefit from a second clean in spring. A 90-minute professional vacuum clean prevents the slow damp damage that costs thousands to fix.