I got this from the MB dealer in Greenwich, CT. Apparently the stuff is amazing. I have a brand new coat of wax I just put on along with Meguiars Ultimate quick detailer, so I dont want to try it yet, but I am considering it. The stuff is called Cilajet. It's supposed to last 10 years and is the same stuff they use on planes. Here is the website:
http://www.cilajet.com/
I will give it a shot some time soon and let you all know the results. The guys at the MB dealer had a bunch of it because the cilajet people are trying to sell them the product to use on their cars. They gave me some to try. My SLK is black, so it's a good test. Will get back to you once I use it!
Anyone else heard or tried this stuff before??