Yes, you are correct. I personally use the Griot's "Spray on Wash" with plenty of better microfiber cloths...but the one you listed is well respected. Now one caveat: I don't use it if car has a deep layer of the "roady-dirties" [Zkeepers Dictionary] all dried on after a trip when it rained, you picked up a lot of the road dirt and then it dried on heavy. But for "minor-dirtiness" [ZKD again] the spray washes work great. Far better than the washateria's down the street.
Spray it liberally, let soak and wipe one direction, changing a folded cloth in quarters [gives you 8 clean sides, outside and inside]....changing cloth surface perhaps each swipe or two. Don't smear the dirt and debris any further. Yes, it does require a lot of good microfiber cloths, but then it's cheaper than digging a personal water line on your apartment car park. THAT might have legal issues that will cost you a lot more than Griot's, or several packages of MF's.
