Cheap PVC windows will turn yellow or pink because the PVC, has been mixed with metallic stabilizers such as lead, tin and cadmium and also packed with fillers such as chalk.
These cheap PVC window mixes are all about reducing costs to produce more windows and doors using as little pure PVC as possible.
These bulked up PVC units are not particularly smooth and will have a chalky residue when you wipe your fingers on them. Given the surface is not smooth you end up with a rough surface that holds ingrained dirt that is impossible to remove effectively. You will also discover companies that install cheap impure PVC also tend to use cheap mastic which will crack, discolour and support mold growth.
The only sensible solution is to replace the windows with windows made from virgin grade calcium organic PVC which is the best quality grade available that will have 10 to 20 year colour fast guarantee when you opt for white.
Another concern is cheap windows generally have poor quality locks and hinges many of which only have 12 month guarantees and no guarantees on the sealed units failing as their is insufficient reinforcement in the frame to
The more crude and considerably less effective option is to paint the windows with PVC paint. Painted PVC looks horrific if painted on by brush and only slightly better if sprayed on. Painting cheap windows pretty much defeats the purpose of having PVC windows however may be an option if replacement is not an option due to finances.
These cheap PVC windows which are not recyclable will be banned by 2015 therefore it is very much false economy to buy these types of windows if you ever plan to sell your house after 2015 as you may be forced to either significantly drop your price or replace your double glazed windows with legal PVC double glazing.
You have been warned!
