Hi welcome from NJ
I cleaned the black rubber on the boards real good and used I think it was called back to black restore . If you do search on this site a lot of your questions have come up in the past . Dave
Helloooooo from Cincinnati! Mine were just done a month or so ago while it was at the bodyshop. They still look great even though they were all chalky beforehand. Someone will chime in with the process soon I'm sure. You've found a very helpful bunch in the Fanatics!
Welcome from Forney Texas!!! You will discover that you have found the BEST FORUM ever! -----Consider going to "Tools" in the red banner, click on "User CP" go to "Your Profile" then click "Edit Your Details". Then, whenever you "post" something, it will show in the left column under your name like the rest of us, and we will know where you are and what you drive. Then when you have a problem, someone close by might be able to help out.
The black surface on my running boards had a dry chalky appearance when I adopted the :ssr a few months ago. My guess is its due to some form of wax application. I used Mother's Back to Black. Applied by hand liberally with multiple passes. After about 15 minutes removed the excess. They now appear fresh as new.
Just a tip, I had the white chaulky look too my running board rubber, I got a tip from another Member and will pass it on too You. Mr. Clean Erasers, wet it down like it says, scrub the rubber and the white will disappear. Once you do that, then apply the Back to Black, let it soak in and then use your microfiber cloth to buff it off. rubber will look good as new.