u/Brazen402

I need some help!

Recently I have come across some windows that has a slight blue/purple ish tint, which I know is some sort of UV protection (Low E as you call it in the US).

These windows are quite new, and I would assume the protection is in between the layers of the glass. But when I scrubb really hard with 0000 steel wool in one place, I get micro scratches. And generally there is a bit more friction than on normal glass.

The owner wanted me to use a scraper to remove some paint, and I couldn't see any scratches after using it.

What is this? And is it safe to use steel wool with not as much pressure?