I read somewhere that you could use clay on windows/glass. I tried it and WOW! what a difference! I`ll bet my `95 Passport`s windows haven`t been this clean since it left the factory!
If you think your glass is clean, try the Baggie test and you`ll probably find it as rough as course sandpaper. Clay a section and re-Baggie. I think you`ll be very impressed.
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