The Konig UPVC foil and composite door cleaner is a solvent free powerful cleaner that removes dirt and other unwanted residue from foiledwindows and composite doors but without damaging the foil gloss effect that asolvent based cleaner would. It can be either cloth or sponge applied, simplyapply over the entire frame and remove all unwanted residue, then wipe cleanwith a clean dry cloth. Repeat the process if necessary