On the chrome cleaning products I see for sale, there is a warning in the small print that it should not be used on chrome coated plastic. I asked at AutoZone, Pep Boys, and a couple of other suppliers as to what they recommend. The response from all was they really didn't know. I got no response from my dealer or the GM website. What is the right product to clean the staining of the chrome on my 2016 Yukon Denali's front grille? Thanks for any help!