Concerning a generator, it depends on what you want to run as some have suggested. On the waterless wash products. Well, there are quite a few now. ONR is not waterless! You mix it with water,wash the vehicle a section at a time and dry it! Never used the QEW.
If you really mean Waterless theirs Dri Wash n Guard, No Wet,and a slew of other products. If I may suggest,think about the complete picture of what and how you want to run your business. I truely don't believe that guys are totally waterless. They say so,but using ONR is not waterless. I'm sort of a cross between the two styles. I do both,depending on the conditions. Place, amount of mud or dirt on the vehicle,restrictions, etc. I try not to limit my business. Yesterday I detailed a Harley with alot of chrome with Dri Wash n Guard. Came out Beatiful. PM ,I will discuss the positives and negatives with you.