July 4, 2013
i've been using this auto wash for many years. it does an incredible job on your entire engine compartment. i warm my engine first, spray P21S Total Auto Wash over the entire engine compartment, let sit for 3-5 minutes, agitate with a soft bristle brush, rinse with a medium hard stream of water. start engine & use an air compressor to blow out the water & dry. results are awesome!