what do you guys use for BLACK trks. it seems i tryed them all and it dont matter what kind of soap i use it dont come clean thru the downstream/w/hot water then high pre. rince.today i had to break out the brush. it's the only way i found to make BLACK look good. and i know there has to be a better way. whan the drivers grab the handle or rub against the truck you can see there hand prints even when i wash .. but using a brush you cant see nothin but black.........any advice???????????????