Vehicles
Using a high pressure wash to clean your vehicle can actually cause small dents and even chip the paint, leaving it vulnerable to rust. If you do use a pressure washer to clean your car, always set it to a low-pressure setting, and never attempt to pressure wash under the hood! It could force water into cracks and crevices and cause serious damage.
Outdoor light fixtures
How many pressure washers does it take to wreck your backyard mood lighting? Though outdoor lighting can withstand rain and other weather elements, you should not pressure wash these fixtures. You’ll risk forcing water into cracks and causing damage.
Gutters
Though tempting, you should never clean out the inside of your gutters with a pressure washer. It’s best to remove debris by hand, and then rinse the inside clean with a less intense flow of water. Gutters can withstand rainstorms, but not the extreme power of a pressure washer.