Kevin, have you used full strength Purple Power degreaser? If so how does Crud Cutter compare?
I have not tried Purple Power. Crud Cutter works well for me. It's spray on/wipe off, but I use a wire brush also on the really heavy buildup. I also use it in a small cup for degreasing fasteners. I may try it when I run out of Crud Cutter.
Back on the pressure washer topic: I've found that I have to throttle back on the water supply quite a bit to be able to suck the detergent into it. Too much pressure (we have 75+psi here at the house. If the hose valve is full open I don't get any detergent.
Evan, you probably only needed 5 psi or so on the air line to those fuel tanks. They aren't rated for very high pressure, so putting them in the dump truck was a good idea with that 45 psi. You're still with us, so they must have held that 45 psi OK.