I just read the post about bringing back the plastic window on the hard top, and it reminded me of a trick I have for plastic lenses. I have used this method dozens of times on TR7 and MGB plastic taillight lenses. Wash the lense with warm soapy water and allow it to dry. Spray the lense with clear acrylic spray can paint. The clear acrylic paint slightly dissolves the top pitted layer of the plastic lense, smooths it out and drys flat. Do a few light coats rather than one thick coat. Once they dry, you would swear you are looking at a brand new lense. It works on both the flat front side and the bumpy back side of the lense. Hope this helps out someone.