Sir! This waterless IMO is not worthy and wastage of money and time. May be it would have been an advantage for white / light colored cars but not for dark / black.
Get a sprinkler which uses very less water along with mild Mags or any other good shampoo with mild / minute concentration in a bucket along with wash MIT. One has to make the car wet and then wipe it with clean dedicated specific MFs for drying like massaging a baby lols. This i find the most easiest way to make it popping up again after 2 / 3 days dust. No streaks in a single wipe.
Believe me it takes just 20 mins on clock, much earlier with less effort as compare to waterless wash. Waterless wash products imo are for west. In the scorching heat and dry dust even under the shade you will initiate blemishes with waterless products despite you use a dozen MFs for the job. All i am telling you about dark and black.
At least this is what i do with my black after experimenting and i am highly satisfied.