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How to Keep Your uPVC Doors and Windows Well-Maintained Wear and tear are normal part of life however they can cause damage to your uPVC door. The damage can be as small as cracks, or a warped frame or broken glass. It is important to keep your uPVC doors in good condition and properly lubricated. Regular cleaning using warm soapy water and a soft cloth keeps them looking nice and functioning well. This will also help keep them from corrosion. Window sills They may appear to be an unimportant decorative element