Power Washer Guide: Everything You Need to Know

Thinking about a power washer for your home? You’re not alone. Homeowners love the fast, low‑effort finish a power washer gives to decks, walls, and driveways. Below you’ll find straight‑forward advice on choosing a machine, timing a job, and handling common worries like mold and safety.

How Long Does a Power Wash Take?

Most people wonder, "How long will it actually take to pressure wash a house?" The answer depends on size, surface type, and how dirty the area is. A typical three‑bedroom home with siding and gutters usually finishes in 2‑3 hours if you work at a steady pace. Smaller jobs, like a single patio, can be done in under 30 minutes.

Speed comes from a good nozzle, the right pressure (around 2,500–3,000 psi for most exterior walls), and keeping the spray at a consistent distance—about a foot away. Hold the wand steady and move in overlapping strokes. If you rush or spray too close, you’ll waste time fixing damage.

Can a Power Washer Remove Mold Effectively?

Yes, a power washer can knock mold off many surfaces, but it’s not a magic cure. Mold clings best to porous material like wood or stucco. High pressure combined with a cleaning solution (a mix of water and a mild detergent) loosens the growth and washes it away.

For tough spots, start with a low‑pressure rinse to wet the area, apply a commercial mold remover, let it sit for 10‑15 minutes, then finish with a higher‑pressure pass. Always wear protective gear—gloves, goggles, and a mask—because mold spores become airborne when disturbed.

If the mold has penetrated deep into wood, you may need to replace the affected boards. Power washing works best when you treat the surface quickly after a leak or flood before mold sets in.

Choosing the right machine matters. Homeowners typically use a 1,500–2,000 psi electric model for decks and patios. For a full‑house job, a gas‑powered 2,800–3,200 psi unit does the trick, but it also costs more to rent or buy. Compare rental prices in your area—many hardware stores charge around £40‑£60 per day for a professional‑grade washer.

Safety should never be an afterthought. Never point the spray at people, pets, or windows. High pressure can crack glass and force water into electrical outlets. Test a small area first and adjust the nozzle to the lowest setting that still cleans effectively.

Maintenance keeps your power washer ready for the next job. After each use, flush the pump with clean water, empty any detergent tanks, and store the machine dry. Check hoses for cracks and replace worn nozzles to avoid loss of pressure.

In short, a power washer saves time, delivers a fresh look, and can handle mold when used with the right approach. Whether you rent for a one‑off clean or buy for regular upkeep, follow these tips and you’ll get great results without costly mistakes.