Maybe I'm late to the party BUT I have just started using Zaino Car Wash/Wax/Finisher and the results are out of this world! Apparently it's a US product that is fully synthetic and totally non-abrasive. I got mine in UK from Rob at http://www.advancedcarproducts.com and will definitely NOT be using anything else! I don't work for Zaino or Rob..../.just wanted to share my experiences with this TREMENDOUS stuff. Once I get my digital cam sorted out, I'll try and post piccies.
My 91 850i had many swirls, slight fades, marks, etc.....Zaino has restored it to absolute glory. It takes a while to "cure" and buff off, but the final spray fluid works some kind of magic on the finish - it's mind-boggling!
According to Zaino and Rob, after 3 or 4 applications, the shine/finish really deepens.........I've managed to get it done twice over the last fortnight (prior to autumn weather setting in), and will aim for a 3rd before Xmas.