Hi All, I have a Brinsea Mini Advance II and I took it out because Im getting some hatching eggs from the Northeastern Poultry Congress this weekend. Well I don't know if I forgot to clean it last year or what but its all dirty. How do you all clean these? It seems like its dirty in the upper part near the heat coil but it looks like its all enclosed. Its not filthy, actually looks like dust more than dirt. Will it harm my hatch if I can't clean this part, will it catch fire? Thanks