Has the plastic turned opaque? If so, the chances are that it is 'past its sell by date'. I had this and no matter what I used, it did not work.
Originally Posted by geegee
Any suggestion regarding a good product to clean and condition the rear plastic window
I had to have a new window fitted. The Stealer wanted approx $600 but I found a local firm of coach trimmers [don't know what you call the in the US] and they did it for only $250.
Hope this helps
E36 320i Convertible - Superchipped - K&N Apollo CAI - Green Stuff Pads - NGK Iridium IX plugs - Pioneer MP3 Headunit - JL Audio Kick Panel Speaker Pods - Wind Deflector - M3 Style Spoiler. 18" Bridgestone 225/40/R18. M Sport type Alloys as fitted on new E90. Alloy Billet Strut Brace, M3 type front bumper, M3 type rear Diffuser. Royal Purple. Hard Top.