Blast heavy dirt, mud, grime, slime, gum, mold, mildew, cement, graffiti, and soils.. off instantly. Saves chemical water, time and money. The Dirt Killer nozzle generates a whirlwind of water droplets so powerful that the imbedded dirt is blown away. Each nozzle features a rotating turbine, delivering the punch of a 0º degree nozzle with a 25º degree fan, creating 10 times the cleaning impact of a standard flat tip nozzle.