In the last six years I have spent managing a full serve wash and detail center I have not heard of a fix. You may want to check out an auto restoration company for some advice..they do this for a living. More than likely you will have to live with the scratch or replace the part.
sorry 
__________________ '06 GT---Mods---Tunable Inductions Intake, Fully Polished Pypes Violator Mufflers, MAG Mirror Inserts, Sequential Tail Lights, CDC Hood Struts, Powder Coated Valve Covers, Window Tints, Pioneer Premier DEH-P880PRS Head Unit, 8" Kicker Door Subs (SSMB8)
Front: Infinity mids/tweets 6812cf; Rear: Polk db570 mids/tweets------ Awaiting Install ---Eibach Pro Kit, DSpecs | 
Scratch on glove compartment 
