There are different types of cleaning and polishing compounds to go specifically with the different buffing pads and a drill chuck arbor for mounting the pads onto your cordless/corded drill.
Complete kit for removing scratches and polish soft metals such as brass, copper, tin, pewter and aluminium 

3pcs x polishing compound
2pcs x 100mm medium buffing padsteel
1pcs x 100mm firm buffing pad

Black Emery – A course compound used for cutting and preparing materials, can be buffed on soft and hard metals, wood.
Brown Tripoli – Used for cutting and removing scratches from soft and hard metal. Can bring out a high luster.
White Diamond – Used for removing deep scratches from soft metals
General Green – Used to finish stainless steel to high luster mirror finish and can be buffed on other hard metals
Deep Brown – Used for hard metals which need deep grinding, to remove deep scratches
All-purpose Blue – Used for all materials, can even be used even on plastic
Red Rouge – Used for buffing soft metals like gold/silver to a brilliant high lustrous finish & will not scratch the finest or softest metals. Polish gold, silver, brass, copper & nickel to a mirror finish.