I probably wash my old beater commuter more than any other bike but only the wheels and tires. The rims and brakes get really trashed by rain and grime. I wipe the frame down once a week and also clean the headlight and taillight lenses then too. I try to avoid washing around the bearings especially the hubs. Even though they're sealed water can get in. The other bikes don't get cleaned as often because the commuter is the dedicated wet weather bike (that even goes for the mountain bike).