I have a few mail carriers that clean their vehicles about 3 to 4 times a week. After she jammed the wand into her wheel well a few times and jammed the tip she asked me if there was a brush available to help her clean easier/quicker? I have cat310 pump,1200psi with a 3206 tip. I see there are some spiral oscillating tips available? What are these? Is there a nozzle size or design that will work better?