Yes, pressure washing vinyl siding could damage it. This is because the high-pressure stream of water can blast away at the paint or sealant, removing it and exposing the raw wood or metal beneath. In some cases, this could cause the underlying material to corrode or rust.
A better option for cleaning siding is soft washing. This involves using a low-pressure stream of water and soap. It will gently remove dirt, mold, and mildew without damaging the paint or sealant.
Thanks to Ascension Home Services from San Diego for sharing these tips!