Choosing a Pressure Washer Vinyl siding can withstand a powerful gas pressure washer (2,500-3,000 psi). Aluminum, stucco or soft-grain wood homes will do better with a less powerful washer (about 1,200-1,500 psi). Determine whether you will rent or buy your machine.

Homeowners with vinyl, metal, or composite siding should pressure wash their homes once a year. If you have wood siding, we recommend you pressure wash only when you have dirt or mildew buildup, unless you use very gentle pressure to wash away pollen or cobwebs on an annual basis.

Since power washing uses heated water, it requires more expensive equipment, meaning you'll pay more for power washing. However, you get what you pay for in this case—especially if you have tough dirt and stains you want to quickly remove from concrete surfaces or other durable materials.

A: On average 1 hour per 20 square meters, but it all depends on the dimensions and the condition of the area that is being washed.