E(2) spent a long time (maybe 15 to 20 minutes) polishing a silver cup when we were at O's school for her last day. She loved every minute of it! Since O(5) also loves the polishing works, I'm planning to have several of this type of activity set up in our new school room.
To polish the silver cup, E(2) dipped a q-tip in toothpaste and rubbed the toothpaste all over the cup. She then wiped it all off with a small washcloth. Fun and simple!