After 6 years of using various waterless washes (settled on meguiar's D115), I finally tried rinseless washing and wow, it's even quicker and easier, I used CarPro Ech2o with a pre soak mix (50ml in 5L water) and it worked great, cleaned well, buffed easy, and left a nice slick shine. Now that I'm hooked on rinseless, I'm thinking of trying ONR next. I also want to know, is it similar to opti clean (which I've tried as a waterless)?