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How deep is the scratch? If it is relatively deep, there are services out there that will come out to your house or office, fill the scratch with some sort of resin, and polish it. Although I've never had it done myself, I've heard that the results are pretty good.
You can try to wet sand the scratch in the glass your self and then polish it to a shine
Not that its not a good idea, but you don’t want to do that on a windshield for many physical reasons, if the windshield is not leveled, it will turn into a lens, which you really don’t want. I say just go with Zino glass scratch remover.
When I got my car, there was some scratches in the driver side window. A lot of scratches, they actualy got rid of the scratches, by some type of polishing procedure. BECAREFUL though,, Most of the time it leaves the window very "Wavy" Almost like gasoline has been spread over the window. You know that rainbow wavy look!!!
I Think I'll Try That Glass Polish - The Previous Owner Of My Car Must Have Bought His Girl On Hell Of A Diamond - Cause All The Scratches Are On The Passenger Window.