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Another thing you might want to try doing is using a razor blade. A new one. At a very fine angle and scrape the entire surface of the window. Spray on glass cleaner then use the blade on it and clean with water and dry with towel. That might work if it is indeed some foreign matter on the outside of the window. Have a supply of blades handy though and keep changing them so they dont get blunt.
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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