.....Answered my own question...the black C30 front seat side material is not leather, but a quality simulated leather. And if they get smeared with sunscreen #30...baking soda and white vinegar, 1 part soda to 2 parts vinegar and soft scrub with a coarse sponge...soft towel dry... reapplication after reapplication until the white smear is gone. A 1 hr job at least.