I used "Restora" on my cladding today. It's a kit that comes from the Flood company that contains everything you need including brushes and the two step chemical process. It goes on like a white milky substance and dries within an hour or two. Unlike everything else I've tried, it doesn't leave a sticky residue to collect dirt. It's guaranteed not to chip, fade etc for years and I must say on initial inspection I am quite impressed. I'll be even more impressed not having to treat my cladding whenever I wash the car. If this works as the claim (for years) then we've stumbled upon a real work saver that gives you the look of freshly treated cladding.