THOMPSON’S UPVC RESTORER, £4.95,WILKO.COM
This creamy paste worked well to get rid of ingrained dirt and on the window frames we tested it on. It even made a slight improvement on the yellowed uPVC on a bath panel we tested it on too. For best results we used a couple of applications on tough marks. After gently rubbing it into the uPVC and leaving it for the time stated by the manufacturer we found the dried paste buffed away easily without leaving any scratches or residue. The product left our window frames visibly cleaner and brighter looking.