I replaced my original rear bumper about 5-6 years ago because the paint had become dull and faded badly. I found one at the salvage yard that was in perfect condition paint wise. I mean once i got it washed and waxed up it was looking beautiful. Now it's beginning to get that dull faded look. I did everything that i thought i needed to do to keep it looking good but no luck. What is going on? Why the bumpers?