I had a black SRT8 and now have a Kona blue GT.
Rinse, foam gun, 2 bucket wash w/ merino wool mitt (washing in straight line back n forth motion) , pool rinse , master blaster blow dry and a lite DS spritz & wipe. My swirling is almost nothing. The back n forth washing motion.... swirls are circular in nature why add to the problem.
I clay, polish, MSS , glaze and Americana top off.