JDReloading supplied anhydrous Citric Acid crystals and 'Wairose Essential' washing detergent. a pinch (about 1/4 teaspoon) of citric and a tablespoonful of washing liquid seems to do the job nicely for my purposes. I read a warning that too much citric can damage the cases, but I don't recall the source off hand - perhaps someone out there in the know could clarify it?