what is a foam cannon
How to Buy and Use a Foam Cannon. A foam cannon, which is used to wash cars, can be found at most tool stores. It is gaining in popularity, as spray pressure washers become more affordable and more people are looking to use them to improve their lives by making everyday tasks easier. A foam cannon is just such a product. Itâs an attachment for your pressure washer that contains a container for car soap. Attached to your washer, the soap in the container, combined with the high-pressure water coming from your washer, results in a thick layer of foamy soap covering your entire car.