Nilco UPVC Window and Door Cleaner 480ml 1 "Disastrous result on our UPVC" Lynette 31 October 2014 This review is for an older version of this product Has seeped into the "grain" of our mahogany effect window frame and front door, leaving an unattractive white permeated finish which we cannot remove by rinsing. Looks horrible. Is this permanent? Don't know. Purchasers beware! Not worth even one star! A note from the team Thanks for the feedback and taking the time to speak to my colleague. I'm sorry that this hadn't been suitable for the type of window frames you have I'll be sure to pass your comments on.