Got an old air cleaner I have just hanging in the garage. Think the base is chrome and under the lid is as well. Going to mess with it next time I'm off and nice weather. Would like to try a few different methods at the same time and tape off sections and label them. That way I can see how it turns out side by side. If the wife's not home, I may do it inside for a "controlled environment". Don't think she'll buy that excuse.