As to the yellowed rear window, I suggest you first try some of the soft-top plastic window polishes sold on Ebay.
I bought one for $20 via ebay UK, but I see there is now one sold on US ebay that is about $8 or so. What I bought worked great, taking away the cloudiness and yellowing.
Only remaining problem is the tearing in the plastic where the window is folded ... that will require window replacement, but this improves the safety of driving significantly in the meantime.
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