I have a leather speed holster/belt that I inherited a while ago and I would like to start using. It has a white substance that appears across the surface of the holster, but not the belt or mag pouches. After some internet research I believe this is “fatty spew” or “spue”. Spew/spue is fat or oils in the leather that surfaces over time and crystallizes. I can clean it and remove it with soap and water but it reappears after a few days which is commonly how leather spew acts. I have read several articles about methods for removing spew and treating the leather to prevent the spew but people seem to have mixed results. Have any of you dealt with this on your leather products? What methods and treatments did you have success with?