Love cleaning my bikes.
Summer bike is bathed in warm, soapy water, rinsed, leathered dry and polished as needed. Before winter hibernation stripped down, cleaned of every speck of dirt, waxed, lubed and hung in the garage under a dust cover. Ridiculous but makes me happy.
Tourer used in wet autumn and spring as well as touring gets a thorough clean as needed.
Winter bike for when salt and crap on roads again as needed.
Some of this is for pure pleasure, other aspects are pride in riding a good looking bike. Practicality means a well maintained and clean bike performs better. If polished/waxed and lubed correctly after a wet mucky ride will need little more than a good hose down.