I have had very good luck with a product called "Beats em all". It's a pure carnaubas wax with no abrasive. They also have a product called "Rub out" that does have a mild abrasive that when used carefully will lift dead paint and restore luster to paint. I also use it on metal oil cans. I pick up a supply at a local car show every year but I'm sure you can find it on line as well.