Questions about black rubber window trim

Hi, all, I have a 1989 Tempo that sat in a ladies yard for 2 years. It cleaned up great, but the black rubber around the windows still rubs off on skin. Arms, hands, everywhere it touches, it leaves a black stain. It washes off easily, but I would like to be able to clean it totally or seal it so it doesn't stain me anymore. Anyone have any ideas? Thanks!!