Over time, a lot can happen to your home’s windows—both inside and outside—including scratches. If you happen to notice some scratches on the glass, you may not even be sure how they got there.

I noticed some smudge marks on my monitor (ViewSonic PF790) and wiped it off with a roll of toilet paper (It was the closest thing avilable). It got rid of the smudge marks but left a few vertical ...