Even cleaning older coins in not always a no-no. If they have no collector value, cleaning them is fine. Use soap and water just enough to see type, year, mint mark, and potential condition before deciding. Common date Roosevelt dimes for instance are only worth their silver value. Same with common date wheats. Tumble them if you like.....it won't change their value any. Good jewelry will need to be cleaned to have any value and they're usually not damaged by doing so. Soap and water is a good start. Electrostatic cleaners work good too. Silver dips like Jeweluster work great on sterling. Costume jewelry might be damaged by cleaning.....but who cares? Unless it some rare designer stuff. Clean just enough to I.D., then decide after doing your research. Check out the clean and preserve section here on Tnet. Lots of other info there.