dont know about the window but my mate told me to use autosol metal polish on my headlamps as they were not the best and he said put a thin coat of wd40 on after you've finished . i thought what the hell as i already tried toothpaste with bi carb etc and when i had finished they dont look as if theres any glass in em there great wd40 also good for cleaning trainers,getting marks or chewing gum off carpets etc
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