Carburetor rebuilding

Ultrasonic won't do squat to RTV or paper gaskets. I'd just soak it in distilled water overnight and the paper gasket material should come off easily. Berrymans will turn a gold carb Grey in no time. Not that knowledgeable on Carter cleaning but simple green is supposed to work pretty good and not discolor the aluminum short of tumble burnishing it with ceramic media in a tumbler.