Does anyone use PSO regularly without any detrimental impact on your brush(s)? I've dabbled over the last couple of years with some PSO (Musgo) and strongly suspect it of "coating" a couple of my brushes. When I did use it, I used very little at a time (4 drops rubbed between my hands for my entire face and neck). However, those brushes that I used it with don't seem to lather as well as they once did. Let me know your thoughts about this working theory of mine and what techniques, if any, you suggest to get things back to normal.