Do now not use razor blades on the windshield devoid of care; while powerful for stickers
https://wifidb.science/wiki/DoItYourself_vs_Expert_Choosing_the_Appropriate_Windshield_Substitution_Choice
Do no longer use razor blades on the windshield without care; whilst effectual for stickers, they can scratch if angled improperly or used with grit.