"How to get rid of streaks, smudges and smears QUICKLY!"

If your glass doors or patio doors are covered in finger prints or smears and smudges from your cat or dogs paws or similar....Simply erase them in a jiffy with a brainwave idea devised by a primary school teacher. When she's in a hurry, she simply rubs a clean blackboard duster over her patio doors which erases all the stains, and smudges quickly and easily without using any glass cleaning products.