The bio on the enhanced CD Robert Schimmel Comes Clean describes stand-up comedian Schimmel as ”one of the brightest lights in humor’s nether regions,” and that’s an apt description: This guy is obsessed with folks inserting things where the sun don’t shine. Besides the audio tracks (”Edible Underwear” and ”Animal Necrophilia” are among the few printable titles), you get short snatches of Schimmel performing in nightclubs and a clip about his fling with an inflatable love doll that makes Andrew Dice Clay look like Alistair Cooke. Worse, the audio is often out of synch with the video, rendering the two or three funny routines nearly as unbearable as the bit about Oriental love beads. D