To see where to get good BHBs, check out my BHB Comparison thread. Really, it's worth the dreaded SEARCH! The PC I'm on makes linking a hassle...uhm...go to "advanced search", search under "BHB Comparison" with my user-name...you oughta find it.
OK, OK, short answer- Buy the "Blonde" ones here:
Universal Brush
I'm awful about this, I never take the time to write up a proper "how I wash". Eh, it's gonna take a few hours of concentrated effort, not the multi-tasking quickie posts I usually do.
Thumbnail sketch (apologies for typos/etc., this is coming out as fast as I can type):
-Mix foamgun concentrate to ~6oz. shampoo per gallon water. Use three most postent foamgun settings, choosing which depending on situation
-Rinse car
-Presoak with foamgun output
-Soak BHB in bucket of regular shampoo mix
-Spray foamgun output at point of BHB-to-paint contact to provide constant flushing and lubrication
-Move BHB in short, interrupted, "jiggling" motions (the interruputions and "jiggling) make it easier for the foamgun output to flush away dislodged dirt and avoiding long, sweeping motions means that any scratches that do happen won't be long/obvious ones)
-Use minimal contact pressure so only tips of BHB touch paint, don't let bristles bend over; you don't want the bristle shafts to touch the paint
-Wash very small areas at a time until you're confident you can do larger ones
-Rinse BHB very frequently and redunk in wash bucket before resuming wash
-Rinse and inspect panel
-Repeat as needed until panel appears clean
-Rewash with mitt using the same technique: fill mitt with either shampoo bucket solution or foamgun output and hold shut at cuff and gently whisk across panel as opposed to wearing like a glove (too much pressure that way)
-Rinse/inspect
-Remove anything that's still stuck to the paint using extra-fine clay, moving clay no more than one inch before kneading to avoid long scratches if something goes wrong, then rewash with mitt
-Rinse
-Blow off water with AirWand and compressor
-Dry with WW MFs, spritzing panels with QD to provide lubrication, do final buff with WWMF after fogging surface with your breath to provide a tiny by of consdensation
Yeah, it's a bit of work, but not exactly what I'd call a workout. No harder than the hours spent before/after doing the undercarriage and engine compartment/etc.