Dont wash your bike when it's snowing, your drive will get slippery, (more slippery) and as I found out today the paintwork was freezing over before I even got to chamois the bike down. ;D
Even more importantly your neighbours will think you are mad, as mine now do. ;D
Amen to that ;D
If you wanted any more reasons, try iced up ignition and topbox locks the day after washing - particularly annoying when you've just filled up with petrol and your wallet is in the topbox......
Martin