You should wash or pressure wash your house at least once a year although some houses may need pressure washed twice a year.
If you have wood siding it's only recommended that you pressure wash when you have dirt or mildew buildup or you could use a regular hose to rinse away any dirt or cobwebs, pollen etc.
The PSI needed to clean vinyl siding is between 2,500 psi to 3,000 psi which vinyl siding can withstand.
The best pressure to wash a house is between 2,500 PSI although for wood grain home siding, stucco or aluminum they do better with pressure washers that put out between 1,200 to 1,500 psi.
Places where you should not use a pressure washer are on gutters, plants, flowers and trees, asphalt shingles, electrical meters and panels or painted surfaces.
The places that need pressure washing the most are decks and patios, store fronts, sidewalks and metal roofs.
Patios and decks are the areas that need pressure washing the most around the home as they can get mildew growth, grime, mold and dirt on them regularly.
The amount of force that a pressure washer puts out is between 1,500 psi to 3,200 psi although some larger pressure washers can put out 4,000 PSI and even as high as 30,000 PSI for very large pressure washers.
The difference between a pressure washer and a power washer is a power washes uses heat and pressure to clean things and a pressure washer uses only cold water at high pressure to wash things.
Other than the difference in temperature used the pressure washer and power washer are the same thing but one uses heat and the other doesn't.
Pressure washing is usually less expensive than power washing because it uses less water and isn't as intense as power washing.
Power washers are better for large jobs, while pressure washing is more suited to smaller tasks.
In inexperienced hands, a pressure washer can cause damage to homes or even to your car's paint, trim, or delicate parts.
High-pressure water can strip away protective coatings and even force water into vulnerable areas, leading to rust or electrical issues.
Pressure washers are incredibly strong, and can break skin and cause other injuries.
A pressure washer should never be used on any living thing—no humans, pets, or plants.
Don't use a pressure washer while working on a ladder or on your roof—the recoil could throw you off balance.
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).