the red on my roof, trunk, and mirrors fades alot... What I do is wash, then do a complete clay bar, then use an orbital to compound (3M Fine Rubbing Compound) then buff. Then use the orbital to glaze (Zymol Concours Glaze) then buff. Then finally use orbital to wax (Zymol or Meguiars) then buff.
That gets it very very red again...