The label on the bottle of Optimum No Rinse with Wax says among other things that it can be used on glass. Granted it doesn't say specifically that you can use it on the outside of your windshield BUT I would advise against it. You would think any fool would not...However I did. The windshield came out clean but the problem was using the wipers the first time it rained! It streaked so bad I could hardly see and my wipers are only two months old. I got home and it took alcohol to get the wax residue off the windshield. Seemed like a good idea at the time.
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