I used blue beacon truck wash in granite city il
They did not use brushes , just 8 guys with power washers, sprayed the windows so hard , water was flying inside from the water pressure forcing its way into the seals. We toweled off the inside, the outside looked about what you'd think for ppwer washing without scrubbing. Mediocre job, for a cheap price, around $20. I would go back, in a bind. But my first choice would be rain, 2nd choice would be paying some kids to help me . 3rd choice - blue beacon.