How to clean hardware - Boil them for twenty minutes in solution of water, 1 cup vinegar and a teaspoon of salt. This treatment will get rid of any old crud on them and remove all those years of greasy fingerprints. (thank you Martha Stewart for this trick- If you try it, you will NEVER want to touch an old door knob again. They are NASTY). These guys went from black and sticky to shiny and sterile.