Do whatever you care to do. If that's hose it down with a garden hose, go for it. I find just wiping it off with a moist towelette easy and can be done inside with the comfort of my HVAC.

When I ride in the rain, I'll sit a box fan in front of my bike to circulate air around all those spaces that are too tight to get a towel in to dry it, so if you do use a hose, maybe consider using the fan to help it dry quick.

Pressure washer? I haven't ever needed to, but if it was dirty and gunky enough I would. Just try not to blast the axles with the wand close to it or else you might force water past the seals and into the bearings. But if you hold the wand back like they say to in the machines instructions, you are probably good. Then, like before, try to do something to dry it off. And again, a fan works wonders for lazy people like me.