there was a thread the other week on this. I have tried to find it but failed.....
could do with getting hold of Tadge for the stuff he sells for roofs
The sample i gave to Darran is a new technology we are looking at from India, initial testing is going well but we have asked them to change it a little so that it is safe and effective on any surface, if they can get it right we hope that it will be as effective as many of the products that are usually recommended for uPVC but without any harmful ingredients, once its finished i will be happy to give out some samples to judge any feedback received. Regards Tadgh
Thanks Tadgh I'll look forward to trying it when its available 
No prob clarkey send me an email with your details.