dave ive just started wfp cleaning using a backpack hoping to gain experience to go larger, one question when cleaning with clx + dual trim brush head why am i still getting runs of dirt on frames or sills after rinsing. what is the nack to this, this seems to be my only worry, water reads 000 tds., any one with advice will be great. would i be best with an aqua adapter to stop water flow, brush dry then rinse again., havent got one yet, my next buy mk 3 aqua adapter