I love my 993 Cabriolet but am not pleased with the scratched and foggy plastic (I think) rear window. What practical options do I have to replace the rear window or do I need to replace the entire roof (which is starting to get a bit worn looking) too? Recommendations on products and suppliers are appreciated.

 

you can try to polish out the back window using some good polish for plastics. a good detailer should be able to help you. a motorcycle shop has good polishes if u want to do it yourself. an upholstry shop can look at the window to see if it can be replaced without the whole top changed.

 

I had to have the rear plastic window replaced on my 993 from so many scratches, polish didn't do the trick

 

At the recommendation of a local shop - Performance Outfitters in Stamford, CT - GREAT guys!) I tried several applications of Plexus spray cleaner and it made a huige difference. They said apply it when the car is cool. I gently rubbed in in by hand and let it sit there for a couple of minutes then buffed it out with a clean cloth. Then a second application with the same procedure.
While the plastic window is still not perfect it is significantly better.