A good solution is 1 or 2 drops of dishwashing liquid like Joy mixed with hot water. Let your diamond soak for a while as the dishwashing liquid will break up grease, grime, dirt, hairspray, meatballs and anything else hiding under the prongs. After letting it soak get out an old toothbrush and apply much elbow grease. Scrub under the prongs and let those bristles penetrate. Rinse and wear. Now excuse me as I have to go pippi.