Some hard surfaces, such as concrete and asphalt, tolerate pressure washing well, and it can be a great way to keep them clean. However, you should avoid pressure washing clay or grass as you'll quickly destroy them.

Additionally, pressure washing can remove paint lines from any surface, so you need to be careful, and it may be best to let professionals handle the job.

It usually takes about two to four hours to pressure wash a 2,000-square-foot home. The exact time depends on how much dirt there is, the type of siding, and whether you’re doing it yourself or hiring a professional pressure washing service. A DIY job can take an average of six to eight hours, but you should plan for it to take an entire day. A pro can get the job done quicker.

It is generally not recommended to use dish soap in a pressure washer. Dishwashing liquid is formulated for cooler water, and the warmer water used in a pressure washer can create excessive suds, potentially damaging the machine's tubing and other components. Always check the manufacturer’s instructions for recommended detergents. If you find yourself in a pinch, you can try a highly diluted solution, such as one tablespoon of dish soap per 1.5 quarts of water, to avoid clogging the machine.

Pressure washing shou sugi ban siding is generally not a good idea. The charring process used in creating shou sugi ban siding involves burning the wood's surface to achieve its unique appearance and enhanced durability. The charred surface is delicate, and pressure washing can easily damage it. Instead of pressure washing, you can clean it with a soft brush or broom to remove loose debris, followed by a mixture of mild soap and water applied with a soft cloth or sponge.