How do ppl go about cleaning and maintaining the plastic rear windows other than soap and water. I think I shouldnt use windex as this might discolor it. Please advise thanks.

http://autopia-carcare.com/miracletowel2.html

Plastic window was yellow and scratched and after applying Armor All and using a 100% cotton t-shirt that window came back to life! The yellow practically was gone and small scratches could be "buffed" (rubbed) out, all done by hand with care.
Hope this helps?