I removed stickers from my windshield that have been placed there for 4 years. However, I couldn't remove the sticker marks. Ex. The sticker is square. When I removed it, it left this thin fine square line that couldn't be removed no matter how hard I rub it. I already gave it a month since I thought I could remove it through constant washing but it didn't.

Maybe you know products that could remove it coz the glass doesn't look good with those stickers marks. Thanks!