I have finally gotten all my parts together for my mods and I'm about ready for final reassembly. I noticed that the plates of steel(new) I had for a deflector and baffles would not really rust on the outside but where I drilled holes the holes would rust when they got wet. I asked my uncle who is a metal fabricator and who made the plates for me about it and he said the outside is covered with scale. Do you take a wire brush on a drill and clean them up or use them like they are. I was trying to find out about it with a web search. I came up with a chromium oxide coating but not sure if that is what this is. I know zinc and galvanizing are not good in a smoker and I don't want to have anything bad on my food that I'm feeding to others. Please help!!!! I'm about to run out of smoked meat and go into withdrawels!