The Chemical Guys Foam Blaster 6 attaches to any standard garden hose and can be used with any standard car shampoo. It comes with a 32-ounce bottle of solution that produces up to 5 gallons of foam. Best Budget: Adam’s Polishes Car Wash Foam Gun The Adam’s Polishes Car Wash Foam Gun is a great option if you’re looking for a budget-friendly option. This gun produces a thick foam that clings to your car and is easy to use. The Adam’s Polishes Car Wash Foam Gun attaches to any standard garden hose and has an adjustable nozzle so you can control the amount of foam that’s dispensed. It comes with a 32-ounce bottle of solution that produces up to 5 gallons of foam. https://9to5machinery.com/best-car-wash-foam-gun-for-garden-hose/