According to the Consumer Product Safety Commission, An estimated 6057 people were sent to the emergency room in 2014 because of pressure washer related injuries. As injuries continue, Consumer Reports has issued a safety alert, demanding manufacturers and retailers stop providing pressure washers with zero-degree nozzles or wands. Here is a video courtesy of Good Morning America: On the Look Out briefly illustrating the dangers (to users) and pressure levels of pressure washers.
In addition to damaging you, the intense pressure will also damage the wood your working on. The high pressure spray can damage fibers in the wood, causing an uneven surface and attracting dirt and slippery green growth. In addition, the spray often penetrates the wood, moistening it and providing an environment ripe for fungus growth and decay. As these processes progress, the wood’s lifetime and natural beauty significantly decreases.