How to remove concrete off windows?
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Have you got a glass scraper? they are great for removing excess paint and could be worth trying re the concrete.
Here's another method:
https://homeguides.sfgate.com/remove-concrete-splatter-windows-29129.html
A glass scraper will work.
Even though a single edge razor blade is a bad idea, if held at the wrong angle,
I still use them at a very flat angle.
I would try a straight edged utility knife or a glass scraper.