The foam gun works by attaching to your everyday garden hose. The water travels through the hose and gun, creating a wet, sticky foam that adheres to your vehicle. The quality of the foam determines how well it removes the dirt without you having to scrub with a wash mitt. Our super concentrated Snow Foam detergent works perfectly with our snow foam gun. Once you mix the detergent and water in the foam gun and shake it to mix, the snow foam does the rest. As it is rare to use the gun and get away with a complete touchless wash, can we include somewhere here that it is recommended to use the gun to snow foam prewash then can be used in replacement of buckets for your primary wash. Simply foam, rinse, foam, scrub, rinse and dry for complete clean whilst minimising the risk of causing swirl marks and hazing.