There are various scratch repair kits online - some people also swear by toothpaste followed by polishing - but we've not tested anything to repair fine windscreen scratches before. In fact, trying to polish the scratches out could make it a bigger issue. Our advice is to get the windscreen replaced - that would be the safest option. If you don't want to opt for that expense, do as much research as you can because you can actually reduce the structural integrity of the windscreen using some of the products on the market that advertise themselves as glass scratch removers.