These pictures are remarkable to me because you can clearly see the failures of previous washes using cheap brightener: the wand marks are everywhere. You can only imagine the reaction of the fleet manager when he saw the trailer interior this clean.
This was done with AB-55 at a very high dilution ratio (well over 30:1) and allowed to sit for about ten minutes.
This kind of work does two things for the mobile wash operator that one cannot overestimate in terms of their value in your business: 1.) Job security, 2.) Good pricing.
Here are the before & after shots. These photos are completely unretouched: