What are the main causes of damage to window frames?

• The sun’s rays and other extreme weather can cause the frame’s colours to fade.
• Dullness is also caused by the purified water that many window cleaners use. This kind of water is great for cleaning the glass, but less kind to the frames.
• Detergents used in the window cleaning process may be chosen because they are cheap, but they can cause damage to the frames.
• Lack of maintenance is a common cause of problems with frames, and this can cause a build-up of damaging dirt or grime.