How many times have you stared in disgust at that dotted, greyed and foggy mirror in the Bathroom and swore yourself to get it good-as-new somehow? Stop despairing!
An easy way to clean that bathroom looking glass is to use a printed newspaper with a little water. Moisten that newspaper and rub away. The printing ink on the newspaper is excellent for cleaning glasses. See them sparkle.
Or add a little water to used tea leaves and use this water to clean a dirty glass window. The window panes will sparkle as the grime vanishes.
Vinegar also works well on paint stains on glass. Heat a teaspoon of vinegar and apply it with a piece of cloth over the stained area. Do wait for a few seconds and then rub with a old newspaper to see the stains vanish.
Here are some more tips for defogging and cleaning mirrors.
Looks like the practice of cleaning the glass with newspaper is interantional
People in Russia do it too!