My car get washed once a year whether it needs it or not; (more if it rains), bikes get less cleaning than that. I do keep drivetrains properly clean and lubricated and every so often I will wipe down road grime but no specific cleaning ritual. Having said that I do rotate through full on lubrication checks(bb/headset/pedals/hubs) of every bike and I will clean a bike before working on it. Oh and I try to remember to wipe down a bike before posting a picture to avoid be too ostracized.....