My 1996 Excel 26SE has a Momo Stainless steering wheel with a black hard rubber coating molded all the way around the outside rim of the wheel. That rubber leaves my hands filthy after 20 minutes or so. I have tried washing it with soap and water and also tried Formula 409. Neither of these seem to get all the nastiness off. Even though the scrub brush comes away black, after everything dries, I am right back to the beginning. I realize this is probably sun-induced rubber deterioration, but is there any way I can clean and coat this stuff so it doesn't come off on my hands?