Just musing that I’ve been using a pressure washer to clean all my bikes now for a year and a half. I’m not completely stupid about where I point the thing, so roughly avoid blasting hubs and bb, but I do squirt the bejeezus out of the frame, chain, cassette, brakes, suspension etc, and I don’t think It’s caused any problems at all.
I’ve probably changed the BB in my mtb once in this time and the headset and BB in a cross bike once, but that’s about it. Pretty normal wear and tear I’d say considering the amount I ride (about 8-14 hours a week).
So I’ve saved a serious amount of time and hassle (jet washing is fun), to no detriment, in fact the jet wash gets the fiddly parts of the bike way cleaner than hand washing and doesn’t need detergents/degreasers.
I’ll put my neck on the line and state that I think detergents and degreasers are more detrimental to bearings than pressure washing.