A friend of mine bought my previous '73 Challenger Ralley... 340-4spd, ps, pdb, cold ac, etc.... daily driver. Car was red with a white top and white interior. I saw his car a few years later after he did some resto/mods, etc... 440-6, f'glss front end, handling suspension, rear disc, etc... and his white interior looked very bright... brighter than I could have ever kept it clean myself... I asked how did he clean it up?.... he re-dyed the seats and re-painted the door panels, and a new headliner, etc.