If the scratch is in the back or side glasses, unfortuntaly any type of buffing will cause the window to blow up. (been there, done that!) Not a pretty picture. It is possible to "lightly"(!!!!) buff side windows and also the windshield but as you already stated, if you can feel it with your fingernail, it will not come out. It might appear as though it is not deep, but when you are talking glass, it is usually worse than it seems.
You may want to try Lesbaru's suggestion with RainX. Never tried it but it certainly can't hurt anything!
Window scratch
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX
Posted
If the scratch is in the back or side glasses, unfortuntaly any type of buffing will cause the window to blow up. (been there, done that!) Not a pretty picture. It is possible to "lightly"(!!!!) buff side windows and also the windshield but as you already stated, if you can feel it with your fingernail, it will not come out. It might appear as though it is not deep, but when you are talking glass, it is usually worse than it seems.
You may want to try Lesbaru's suggestion with RainX. Never tried it but it certainly can't hurt anything!
What part of Maryland are you? York, PA here.