clareriley
Fish Addict
If you ever have a tank with paint on or left over tape, Use nail varnish remover or pure vinigar and it works a treat 
Windex and a razor blade works well too.

Found out the alcohol doesn't have much use with the steel wool on glass, but the steel wool pad alone cleaned off stuff I thought would only come off with a belt sander. Hard water & calcium stains come right off with a little bit of scrubbin. I did wind up using alcohol with a paper towel to remove some finger prints & oily skin smudges. When I was done, it was clean enough to where you didn't think there really was glass there.