This stuff is every bit as good as everyone said it would be!! I ordered 2 gallons since I didn't want to jump into a 5 gallon supply without trying it first. Now I wish I would have gotten the 5 gallon!! It did an amazing job on the fender wells, springs, frame, bumpers, everything that I usually have to scrub with a brush underneath. These areas are clean enough for me with no scrubbing, and I am picky! I used just the chemical guys foam blaster foaming sprayer you attach to the garden hose with the soap and water mixture as shown on the sprayer bottle. I have low water pressure compared to most, but still it did an outstanding job. I did use 2 applications of this underneath. I used it on the rest of the machine then also and it worked well. It did not remove the muddy water spots that had dried on from the weekend on the plastics, those I had to use light washing on. I was very skeptical, and was just looking for anything to complain about, no complaints, great stuff! I used maybe 1/4-1/3 of a gallon on one long wash with the gun set at max foam.