Guys, Here is an original piece of acrylic rails from July. 2004, that we placed on top of the metal roof of a building. Exactly Five (5) years later we removed it for inspection up close. This project started on the very first hand rails for our knowledge when we started the Puma in 2004, 2005 model year and is off the original rail cut. This rail had some trash and overspray from laying up there, out back where the fans vent. Though it really is in almost pristine condition on the plastic (acrylic) rail. We have not done anything to it other than clean with soap and water after pulling it down. It also only has slight yellowing. We have others in testing also as we go along through seasons. We have found the acrylic rails to out perform expectations if they are cleaned with soap and water. Waxes, compounds and other cleaners do seem to crystalize the surface and permit more yellowing and crazing. Almost softening the outer shell. You will notice a clean with mild soap and water label on a new windscreen. Now you know why they want that tag left there for you the consumer to see. Our suggestion is to clean it as described, and if not, then we have found you will see this result. Rick