I third the cam gear as the probable source. Pull your timing cover and take a look.
As far as your window tint. My 1967 122S wagon has the same issue. It began life a nice dark blue, but was painted white and the windows were tinted when it moved to Texas with the original owner. I bought it with 500,000 miles from the original owner and drove it home in May 05.
I couldn't stand the tinting - especially the windshield strip. I got the tint off with a simple rasor blade wand (red handled long tool with a clip-in razor blade on the end). Spraying the tint with a 409 or Windex will help get the tinting to release and come off where you've scraped it. It smells awful when it comes off, but you'll be happy with the final result. Let me know if you need any further info about stripping the plastic film
Also, I'm down in St. Louis. If you come through, maybe our Volvos can meet :)
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