I'll wipe down/clean my wife's and my own bike after every ride we take. You spent a lot of money on that machine and all it wants is a little bit more of your time to keep it running good. Yes, it will still go fast dirty just like a car but it sure is nice to look through a clear windshield and have the inside vacuumed out. I think I take better care of our bikes than with the car cleaning. As far as mechanics enjoying working on clean bikes, cars, etc., my wife is an OR nurse and she has some stories about people's personal hygiene. If you can, please take a bath or shower before coming in for surgery if possible so i don't have to hear how dirty your belly button is (amongst other things).