First off i wanna say hi im new around here. I just bought my first pressure washer although its a cheaper sun joe electric 2300psi 1.6 gpm. I wanted to get into using a foam cannon sense i drive a transit van for work. Using it for the first time today just as a test run although its raining. After applying the soap and letting it sit for a couple mins i rinsed it off. None of the dirt came off. I can wipe it off really easy with my fingers but not the pressure washer. Its a new 2020 transit so the dirt isnt stained on. Can anyone help. Thanks and sorry for the long post.