If I'm feeling up to it, I use meguiars quick spray detailer, (the lubricant you get with their clay bars) to prep the surface, making sure there's no remaining dirt after the wash is left over, followed by meguiars 365 paint protect (lasts a couple of months longer than the next method). Although now I'm older and lazier, and they have basically combined those 2 in their waterless wash and wax (just make sure to shake the bottle frequently as you apply, be generous, and use 3 microfibers not 2 = apply/dry/buff). I Still wash (jet wash, foam and mitt), still do a quick drive, then use waterless wash and wax and I'm good for a few months of touchless jet washes with only water (preferably DI). Dirt just falls off. Once the beading is reduced and you start seeing road film remain, repeat. I've cut down my actual touch washes to 3 a year and that's with jet washing the car in winter once a week to rinse down the salt (touchless and only water, don't forget the wheel wells and undercarriage).
Application is easy and gentle, no hard rubbing required for either post wash method.