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Yes, you must thoroughly clean your deck before staining. If you don't, dirt, debris, grease, and mildew can get trapped between the wood and the new stain. This not only looks unsightly but also prevents the stain from penetrating the wood properly, reducing its ability to protect the deck from weather and UV rays. As a result, the stain won't last as long or look as good. Any existing mold or mildew left untreated can continue to grow beneath the new stain, potentially leading to wood rot and structural damage. Always wait at least 48 hours after cleaning for the wood to dry completely before applying stain.

Experts agree that spring and fall are the best times to pressure wash a home's exterior due to the milder weather. Aim to schedule the project once a year during a warm, dry season, typically between March and November, depending on your local climate. Many prefer the spring to clean away dirt and grime that has gathered over the winter, preparing the house for the rest of the year. You can always perform touch-ups in the summer or fall as needed.

The answer to how often you should pressure wash your house is the same no matter whether your siding is wood, metal, or vinyl. Plan to do a project like this once a year with occasional hand cleanings in between to remove unexpected dirt—like debris from an especially violent storm or droppings from birds flying overhead.

This process doesn’t necessarily require soap or detergent, but it definitely helps. You can get by with just using water, but remember, brick requires a lower-than-average pressure level when compared to concrete, so forgoing detergent increases the time it takes to spot clean stains and debris once you finish with the pressure washer. Brick is especially porous, so the less water you use on it, the better.