At our last training i realized just how bad my shields are getting. They have the normal wear and tear surface scratches and are getting rather hazy. What have some of you done to clear them up? I was thinking about plastx or novus but i don't know if that would contaminate them. My main concern is how would the leftover coating or residue be affected by the heat of a structure fire. Ex.= changing colors, baking, burning, exploding etc. Thoughts comments suggestions?