I use the Dr Bronner 18-in-1 Castille Rose Soap to wash my brushes. It's easy to use, just pour a little into the palm of your hand and swirl the makeup brush in the soap, making sure that the water runs clear when rinsing out the soap. I then leave them to dry on a clean flannel. The soap is gentle and the rose scent not overpowering (I also have the lavender scent). I have to admit that it is a little time consuming and boring, but I'd rather spend time doing it than end up with a break out on my face!