Was your process similar to what is in this
video?
I have both the foam gun and the cannon and I like the foam gun when it comes to the step of washing the car with a media. I had a similar thread up for the foam cannon and how good it is when compared to other types of foam, but I decided to try a stronger soap mixture for my next attempt. However, my process is to use foam cannon foam for the pre-soak and then wash using the gilmore foam gun.
Back to your issue, if you are using the process in the video then you should look at you soap mixture. I would think that it is too weak if it is not removing the road grime IMO.
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