This is silly IMO! I have had my PW mustang over a year now and used as a daily driver, washed it maybe 5 times and the bumpers are barely different color from the rest of the car. Not enough to biatch about and certainly not worth a repaint! I have 31,000 miles compared to your 6,000 mile 1 1/2 year old Shelby all I can say is stop rubbing it down in the garage, let it do what Henry Ford envisioned "drive it"!
A perfect old ad punchline from the '80's qualifies here "have you driven a Ford lately?"
2011 Performance White 5.0 Premium 6spd MT, 3.73's, 401A
Mods: Staggered 18" FR500 wheels with 255 45 18, & 295 45 18 tires, Air Lift Drag Bags, Roush axle backs, Eibach Pro springs, BMR Adjustable Panhard bar, Center Fog grille, MMD Hood Struts,BAMA Tuned, JPC Line Lock, Blowfish Racing Bracket