Power washing detergents fall into six main families: alkaline degreasers, traffic film removers (TFR), foaming agents (snow foam), fuel cleaners, hydraulic oil cleaners, and food fat cleaners. Each works on a different kind of dirt, so you pick by soil and surface, use the mildest mix that works, let it dwell, then rinse before it dries. Power washing detergents come in six main types, and each one targets...