Well I'm going to chime in here and recommend Refinish Restorer. Sea Jay....if you check the Avalanche web site and search that product or do a Google for it and hit the Avalanch entries you will find that most of the testing is done and bar none it gets the most favorable responses. Now, seeing that I've been using it on all the plastic pieces that are black and believe you me trust me when I say you won't be disappointed. My car has never looked better and I haven't had to dress those pieces since I did them 2 years ago. I do the fender well liners with it and its just a matter of hosing them out for clean and they return to black and shiney. I will say that because the wells get abused a redress here once a year might be called for. Plastic wiper arms are a thing of the past with no deterioration due to loss of UV protection. The stuff is expensive and the process can be long (12 hour) cure time, but well worth it. All this in my opinion of course.