Power burst , and hydrogen peroxide on the stains that were left plus some good agitation . And a good dwell time . 30 mins plus
Power burst in a strong mix seems to foam up and lift the soiling out where shockwave not as much . I still prefer shockwave as it's cheaper and a great product , I use it on most jobs and have no resoiling problems as I've been back to several jobs over a year later and there was no resoiling issues present and I just rinse with water with some soda crystals . Works for me
Neil