Loon Stanley's Ice Off Paste

One method to remedy the winter-time hassle of icy guides, rub a little bit on with your fingers at the beginning of the day, re-apply as needed. 

Here's what Loon has to say: 

"A non-toxic anti-freeze paste for lines and guides to help keep them from freezing, even when temperatures are dipping below 0. It is safe for the environment as well as fly lines and rods."