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: Purified Water, Non-ionic surfactant (Plant derived) ≤ 5%, Citric acid, Pyrus sorbus (Rowanberry) fruit extract*, Ethanol (Vegetable origin), potassium sorbate (Food grade preservative), Aroma.
* certified organic ingredient.
How to use: Just spray and wipe. For tougher marks, leave to act for a few minutes before wiping.