Foam Gun

A foam gun is the garden-hose version of a foam cannon — no pressure washer required, just connect to your spigot. Foam is thinner and dwell time shorter than a real cannon, but it still beats pouring shampoo straight into a bucket for pre-wash dirt loosening. Use it when you want some pre-soak benefit without the $200 pressure-washer investment. Pair with a proper car shampoo (dish soap will strip wax), a wash mitt, and the two-bucket method for the actual contact wash.