I have used Albolene which is a moisturizing cleanser on all types of trade beads be they old dry trade beads or just beads with a dull look to them. Not only does Albolene help to clean the dirt and grit off it also imparts a very nice sheen to the beads. Even the driest trade bead will look 10x better. Albolene contains mineral oil, petrolatum, paraffin, ceresin and beta carotene. I've used it for years and there is no smell or breakdown of components and the beads still look great.