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You can use a pressure washer to clean a whole host of surfaces. The exterior siding of your house is one of the most popular spots, as well as your driveway, garage floor, patio or deck, and even your outdoor furniture. Just be mindful about the amount of pressure you apply to different materials—concrete can handle a lot more than wood, for example.

On average, cleaning a roof will take between two to five hours. This timeline depends on the size and slope of your roof and the severity of any stains. Cleaning roof stains can take additional time, especially if there are signs of moss or algae.

In addition, the age of your roof makes an enormous difference in the time it takes to clean it, as older roofs need more gentle care. If you have significant landscaping in your yard by your house, your professional roof cleaner will need additional time to protect it from cleaning chemicals.

The best time of year for roof cleaning depends on your local climate, but generally, late spring, summer, or early autumn are ideal. Plan to clean your roof on a day with dry weather and moderate temperatures.

Late spring and early summer are excellent for cleaning off grime accumulated after a snowy winter or wet spring. Summer often provides the necessary dry conditions, though in very hot climates, late spring may be more comfortable. Alternatively, cleaning in late autumn can clear away debris like leaves and branches before winter.

Avoid cleaning your roof when it is cold enough for water to freeze, as this can cause dangerous ice buildup.

You should avoid using a pressure washer on any surface or item that could be damaged by the high-pressure spray, as some materials are too delicate to withstand the force.

Key items and surfaces to avoid include:

• Electrical Components: Never pressure wash electrical systems, as water can cause short-circuits and create a safety hazard. This includes utility meters, breaker boxes, electrical outlets, generators, and HVAC or air conditioner units.

• Delicate and Fragile Materials: Fragile items can crack, shatter, or be stripped by the pressure. Avoid pressure washing windows, glass, light fixtures, shingled roofs (especially asphalt), and stucco.

• Painted, Stained, or Sealed Surfaces: Unless your goal is to strip the finish, do not pressure wash painted surfaces, stained wood (like decks), or anything with a protective seal that could be stripped away. Be especially cautious with older surfaces that may contain lead paint.

• Soft Woods and Certain Decking: Delicate surfaces like softwood, composite decking, and antique or wooden patio furniture can be etched or damaged. If you must wash wood, use a lower-powered pressure washer with a wide-angle nozzle to prevent damage.

• Living Things: Never use a pressure washer on people, pets, or plants. The force can cause serious injury and will destroy landscaping.