Keep the high pressure nozzle quite some distance from the bike. The pressure is high enough to force water (and soap) pretty much anywhere. It can blow the fork seals, get water into the engine, steering head bearings, swing arm bearings, all the lights, it can destroy O rings in the chain, and a whole lot of other bad things. I have never pressure washed a motorcycle. I took a 2 year old work truck (belonging to my employer) to one of those car washes once, and it actually took the paint off the front bumper. It will remove bumper stickers from chrome bumpers. On cars it can damage the seal around the windshield. It is that strong.
2016 Rebel, 2013 Royal Enfield B5, 2009 Genuine Stella, 2006 H-D Sportster 1200, 2006 Vespa GT200, 2001 Yamaha XT225
"I refuse to believe in a risk free society where the thrill of living is traded for the safety of existence." — Nick Ienatsch