Your kitchen uses 450 watts of lighting. How much does it cost if the lights are on for 8 hours a day, every day for a year if the local electric company charges 9 cents per kWh?
Most of the time, people use foam cannons to wash their vehicle with their pressure washer because a pressurized washer can knock dirt off better than a standard garden hose. However, if you enjoy having a car that is even cleaner than what a pressure washer can do, then you need a foam cannon.
Foaming,in a transmission or an engine, occurs when rotating parts ( crankshaft weights in an engine, rotating gears in a tranny ) splash in the overfilled oil/fluid reservoir or crankcase. Foamy oil or transmission fluid, I would think, is not as good a lubricant or heat transporter. This splashing also leads to excessive fluid temps, the tranny fluid degrades very quickly, and the transmission ( auto ) fails.