You may have an image of washing a car in a driveway with a hose and a bucket of suds, but the best foam cannons are a ...

Attaching a spray gun to your pressure washer hose gives you that greater ... then you'll want a foam cannon. Specifically, you'll want Harbor Freight's Wide Mouth Foam Cannon.

It can be used in a variety of concentrations, but the instructions suggest starting at 100ml of product to 500ml of water from a pump-spray bottle or a pressure-washer snow-foam cannon.