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I had very dirty and contaminated exterior glass after it sat outside. During regular cleaning, I felt a lot of friction and resistance under the towel and streaks no matter what technique I tried.
Using rain-x eliminated every bit of residue, haze, adhesive, and sap that was on all glass. It's not specifically mentioned on the bottle, but it works wonders as a glass polish. It even removed the residue from the off-gassing of the dashboard without requiring a multi-step process.
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