How to Restore Faded or Oxidized Plastic: Comparing Heat vs Paint Thinner and Boiled Linseed Oil. Which method works better? We test out both methods on this sun damaged ATV.
There is another video where a guy does regular paint thinner and boiled linseed oil . Mixture has to be 60/40 mixture , 60% paint thinner and 40% boiled linseed oil . It worked on his red four wheeler . If there is built up crud well you have to scrap that off
It looks like those are painted surfaces, so plastic treatments would not be helpful unless you remove all of the paint first. Then you just buy a rattle can of plastic paint. Try acetone to shine up bare plastic.