I just bought some, its named g1 Wiper proof glass nano coat. I'm yet to use it on my GTI, just waiting for a dry weekend to give it a try.
Their contact details are
GTECHNIQ LTD
UNIT C HAPPY VALLEY IND ESTATE PRIMROSE HILL KINGS LANGLEY HERTS WD4 8HD ENGLAND
Contact: Robert Earle +44 (0) 192 326 4344 robearle@gtechniq.com
Email Rob, he sorted me out with windscreen treatment, and their c4 cSystem for black plastic trim. I have heard a lot of good reports about their products, from users on Detailing World and reviews. Its not cheap, but just an example, the glass treatment has been proved to last 30,000 miles, and the black trim nano coat makes trim look like new, and lasts 2 years! It even resists multiple washes with neat detergent, washing liquid, and was only affected by repeated washes using a high powered truck wash!
A few links that might be of use
http://www.detailingworld.co.uk/forum/showthread.php?t=69525http://www.detailingworld.co.uk/forum/showthread.php?t=93070http://www.detailingworld.co.uk/forum/showthread.php?t=66661HTH