Reply With QuoteI'd try stove top cleaner in a small area before taking a blade to it, e.g. Cerasel. Bear in mind, if the blade isn't in good condition or lubricated, it'll scratch the surface.
As suggested, using a blade like you'd use when cleaning the glass stove tops would be the next approach. Use a lubricant; car wash, detergent, spray and wipe, etc. It'll be a reasonably long, tedious process due to the size of the wind screen. Could try soften the surface with very hot water, add a detergent too (though bring the glass temp up if you're talking very cold conditions).
I used to be a detailer for Alfa Romeo years back, we'd have to use a blade on the windows to clean them due to protective film/wax which was on them from factory to protect from contaminents during transit.
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