How do I clean my bike in winter?
As a bicycle mechanic in the Netherlands, I always advice not to use a waterhose. Rain doesn't get into your bearings and chain, while water from a waterhose sometimes does get in nasty places. I sometimes see chains or even a bearing which is rusted because the oil/grease is 'hosed away'.

You can safely use water out of a bucket, with a sponge. But do not use a hose. Especially not a high-presure hose!

The best thing to do is clean the bicycle entirely with some cleaner without grease. Based on silicon for instance. Spray it on the bicycle, and clean the bicycle with an old cloth. 

Grease your chain again. And grease all metal parts (bolts and stuff) with some thick grease such as vasaline.