Because instead of clarifying matches, Boots, Tescos, Unilever, etc want to sell us soap.
Because soap makes us clean. They say.
Because cleanliness is next to the best way there is to sell more soap to get you more clean.
Because every time to eat off a plate you foul it and Unilever want you to believe that their chemical restores the plate to pristine purity.
Because dirt is alien, to be destroyed.
Never wash. Burn burn burn.