When I used Opti clean in a pump sprayer I used a fair bit of product as I like to put it on pretty liberally. It cost almost as much as a touchless wash around here. The rinseless concentrates I use are usually diluted around 44:1 or 48:1. In that range. I wish there was a version of Opti clean in that range. I find the pump sprayer uses more product and I could probably use less if unused a trigger sprayer as it makes a finer mist, but at a cost to my hand lol. A pump sprayer for me seems to use around 40 or so oz I think. But like I said I’m liberal with it and that is probably overkill.
in canada here a gallon of Opti clean is around $60. I would never consider the RTU options, when comparing to any of those I’ve seen opti clean is a deal.
if it were me doing a business, I would probably have waterless as an option when I needed it, but if I can use rinseless somewhwere I would use it case by case as that will always be way cheaper.
I agree there is something nice about using waterless though.