Have you tried to solve Pythagorean theorem doing it on the window? A blend of organic plant extracts effectively cleanses all your windows and mirrors not only from evidence of doing math, but also from dirt and grease.
INCI: Aqua (Water), Ethanol (Vegetable origin), Anionic surfactant <5%, Non ionic surfactant <5%, Citric acid, Sodium chloride, Pyrus sorbus (Rowanberry) extract*, Perfume. * certified organic ingredient.
How to use: Just spray and wipe. For tougher marks, leave to act for a few minutes before wiping.