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That will only dull the frames and take off the shiny appearance!my brother owns one of the biggest upvc manufacturers in chesterfield and he's totally against using anything to abrasive!
I think the best thing to do is try a sample area....it either shifts it or you do a runner...Its a risky business if it goes wrong...you know who they will blame..
and of course you have a time guide from your sample area to price it with...