I've got some Crystal-Glo acrylic motorcycle polish. Let's see if it does any good on the grey plastic. The Stoner's Vinyl & Plastic Coating didn't last more than a week (it didn't hold up to the rain & a car wash) - maybe because it was an aerosol & not enough product was used; but it was easy to apply & made the plastic look nice. Stoner's Trim Shine is a good product. A cheap alternative is generic furniture polish spray - I use the Everyday Living Orange-scented polish from Kroger - ~ $2.79 for a 12 oz can. It's a good plastic cleaner & polish.Squishy said:I use an acrylic-based polish and UV protectant and it gives greys a shiny "wet" look. I can't remember the name of it, but it is made by Crystal-Glo.