[maceyr]

I wouldn't suggest applying anything especially Windex on the glass. I usually give a bit of my breath and wipe with a lens cloth. Works fine.

As for toothpaste, it's abrasive and eventually, you will create small scratches on the glass which may cause digitizer detection problems in the long term. I only use toothpaste on badly scratched CDs to make it readable. But toothpaste is abrasive and isn't a good idea.