I use a hose and a long handled brush on mine when there's mud caked on the frame/fenders from a wet ride. If there's anything stuck in moving parts (brake/deraillers, etc) I wash it out. I've never done more than scrub the dirt off (IE never polished, etc). It's new this year.
Of course, I also never wash my car. I specifically ordered my car denim blue because you can't tell if it's dirty unless it's got about 1/4" of mud caked on, and the rain washes it off before then.