Thanks MDTOM. I have some 220 grit I use on the copper and stainless. Will give it a go on aluminum.
Sawyer, do you have 91% alcohol pads? I tried some 70% the other day on a call and lost all grip. Put some 91 on a paper towel and wiped it again, had some grip after that. Thanks for the chalk tip, hadn't thought of that. I have a cube of rain chalk so I will give it a try.