I have some chrome polish Ill try that, however I tried that on the chrome part of the grill and it didn't do much.i used to work at a friends chrome plating company and it would be impossible to chrome just a section of a piece. its either all or none. maybe you can polish and buff it?
There are processes to chrome plate plastic. I have no idea if the Malibu has any though.Real chrome is metal based, that is plastic. Weird that yours is wearing. The wife's looks new even after 30K.