I have a 2003 Avalanche and I have used Refinish Restorer to treat the plastic for about 5 years. (Can't understand why this site won't carry it) Lately it doesn't bring backthe black as well on some parts. I used Splution Finish yesterday and like the results. After it dries, I was going to put Refinish Restorer on top to increase the life. Has anyone tried this?