I've always taken my cooking grill inside and washed it with soap and water until its clean and shiny each and every time I smoke or grill. A friend was over a few weeks ago and laughed when he saw me doing this and told me I was nuts to do that. He said all you have to do is just heat them up and brush them down with a wire brush after cooking. Told me not to worry if they get black...that's just extra flavoring. Well hell that sounds good to me, lot less work too. So do you all just heat em up and brush them down or do you wash with soap and water? Can they also be left outside in the grill/smoker or should they be stored inside?