How to bring back a nice clean look to sun faded or dry rotted trim. Stuff to buy: 100% cotton terry cloth detailing towels. 1500 grit wet or dry sand paper Meguire's Tech Protect Meguire's PlastX or similar plastic polisher Sun faded /dry rotted door trim: 1500 grit sand paper and a bucket of warm soapy water. Clean the trim with the soapy water, then sand it out, being careful not to hit the paint. Sand with a heavy hand at first to remove a good layer of the old plastic / rubber. Keep the paper clean with lots of soapy water, you want to use it as a lubricant and cleaner while sanding. When it looks good and clean and the rotten layer is gone (will have a very dull finish when dry, this is OK) switch to a very light pressure to buff it out. Almost no pressure at all, more or less getting a little bit of a polish going. After it is all sanded out and you've "polished" it lightly with the sand paper, wash it in warm soapy water, rinse and wipe it completely dry. You should be looking at a nice clean flat black surface. This is where you bring out the plastic polish on a 100% cotton terry cloth towel. Never use synthetic towels while detailing a car. Use plenty of polish, follow the directions, and polish the trim out. It works like a rubbing compound and polishes it right up to a low /high gloss. Now you need to clean it one more time and apply meguire's tech protect. I recommend this stuff over any other trim cleaner/conditioner. Wipe it on pretty heavy, work it into the trim with your bare hand and let it soak in for a couple of minutes, then with another dry cloth, wipe off all the excess and buff it out. You are now looking at a brand spanking new looking piece of trim that will look good for years to come. This works on all plastic and rubber trim, mirrors, etc. You can even remove light scrapes and scratches with this method. Goops: You can also use it on the body skirts, but they are textured, so you want to use incredibly light pressure and sand as sparingly and evenly as possible. Final step: Enjoy your new trim!