Up in Wisconsin-land, I washed my good winter bikes in the bathtub (making sure to dry them thoroughly). Outdoor washing was not an option - anyone who keeps a hose hooked up November-April is asking for a busted pipe!

The kitchen is fine as well, but then I have to mop. I hate mopping.

Baby wipes are also convenient, especially if it's just a bit of mud or road spray rather than three inches of frozen-on gunk. I use them for summer cleaning, too!