Glenn, I have a 50s machine that the finish has yellowed extremely, will the french polish lighten this up some or is there another method for this. It is a blue machine that is now green because of the yellowing. I thought at first like some of my other machines it was just oil and soaked it good with the hand cleaner I like to use that usually works and have used on other machines but it did not come off except with a wet sand like you would do to a car finish clear coat. I tried it in a spot only. Thanks for any help you can give me. L