I've been reading through many older posts in my effort to learn about cleaning/restoring an old kettle. Lots of terrific (and much appreciated!) information shared by very generous members. Maybe I've overlooked information that is already here someplace, and if so, my apologies. I'm looking for input about cleaning/polishing aluminum parts. What grit paper should I start with? Any liquids or compounds used? I remember someone mentioning using Mother's brand. How do you best apply this? I've seen a few awesome photos here of older kettles with ash catchers and pans, etc. that look nearly new. What must be done to get results like that? Thanks much.