This is my method as well. I wash with Chemical Guys soap/brush. Then after dry I apply spray on Chemical Guys "Nice n Wet" tire shine. It makes the running board very slightly slippery for a day or so, but it's honestly not bad.I spray tire shine on a tire brush and wipe them down with the brush. However, I have to do this on a reoccurring basis as they will get dirty again (and they are a little slippery after application).