Well yes, it all depends. First of all just in general those brushes beat the heck out of the paint. If the guy ahead of you had a big blob of tree sap on his car, it will stick on the brush, pick up some sand and then do a good job on your paint.
A bucket and sponge is the way I like to do it. And get down on the ground and blast the whole underside of the car too. Once in a while I open the hood and rinse off everything under there too, including the engine. It doesn't hurt anything.
1992 green ssei. Tan leather, moonroof, power everything. 161k miles
Goodyear RSA Plus 225/60/16 VR on chromed factory crosslace rims. McGard chrome lugs.
Audio system: CD player w/equalizer, subwoofer (all stock).
Delco premium wires, NGK TR55 plugs, K&N stock style air filter. Ceramic brake pads. New rear brake tubing and proportioning valves. New wheel cylinders, front rotors and calipers. New front wheel bearings. Replaced crank sensor and harmonic balancer. Rebuilt instrument cluster. Cleaned A/C evaporator. Valve cover gaskets. Alternator. Front stabilizer links. Replaced all power steering lines and transmission lines. Cleaned MAF and IAC. New door appliques. Rebuilt steering gear. CERAMIC brake pads, I love them. I am listing all this in case someone needs advice on any of these repairs.