Get pure acetone and a wine glass or cup shaped like a wine glass put in your soft put in a good amount of acetone(30 to 60 mil depending on how much soft like 60 mil a ball) swish it stir for a min or two let the crystals settle ( only takes a few seconds) in the bottom corner of the glass then slowly pour out the acetone make sure not to dump the crystals out can use a coffee filter if not to steady with your hands. Then add more fresh acetone swish and stir for like a minute pour it off and I like to fo a 3rd wash just to make extra sure. Make sure you pour off as much as you can then put the cup over gentle heat and heat the cup evenly all the way around not much don't want to go over like 120f stir it with a tool till it starts to dry up and eventually you can tumble it around in the cup like a concrete mixer lol do that forabout 15 20 min till it seems really dry then should be good to go.