The product is Voom RV Cleaner and Degreaser. The name sounds like something you would hear on a late night infomercial. But I can assure you, it is far from a fly-by-night cleaning product. It is truly amazing.
It is generally sold by the gallon in a concentrated form. You merely pour about an inch or so into a bucket, (more if the vehicle is extremely dirty) fill the rest with water and you are set. Using a long handled brush, apply it to the surface. No rubbing, just brush it across the entire coach body doing only an area of 20 to 30 square feet at a time. Now rinse with water, washing all the soap off. That’s it! It will dry with what is as close to a spot free finish as you can get without special equipment. RV washing should always be spot-free.
Voom The Best RV Wash
I have used this with well water, city water, hard water and soft. The results are always great. I once washed a dirty black H2 Hummer in 10 minutes using well water. Once finished it looked like it had been waxed.
The manufacturer is in Georgia, and I have no connection or interest in the company. I use Voom RV Cleaner, the best RV wash product, not only for my rig, but on my cars too. I have found nothing that will come close to this product after over 10 years of using it. If you have never tried it, please do. I hope the results for you are as good as those I have found.