Aluminum frame but others in the forum would benefit from the info.

The best I can do with regard to removing crud would be to wait until the bike warms and then give it a shake (ie, go to the bike cage at morning break). At home, the outside water hose has been turned off because it would freeze so there is no water available until the spring.

I'll just have to try to avoid really slushy days, keep the chain well oiled and be prepared to replace it in the spring.