I use an 1800psi Karcher pressure washer on my cars, and two wash buckets(clean w/soap and a rinse). I will spray my car really well, knocking off all the heavy stuff, before even thinking of taking a wash mitt to it. When it's time to use the microfiber mitt, I wash from the top down, hitting the rockers last. Careful around any seams along the rocker panels, or around the bottom of the fenders, that's where sand/gravel will gather, and all it takes is one grain to ruin your day. I also use an electric leaf blower to knock the heavy water off, and lightly use a microfiber towel to dry the rest. I'm OC about my paint, but doing it that way, I have no scratches, and no swirls. Most paint damage is done when washing.
Guns only have two enemies...Rust, and Democratic Politicians.
Black Rifle Club Member #768