Dr. Bronner’s liquid soap (I use the baby/unscented kind) in a 1:3 or 1:4 ratio of soap to water. I mix it in a small, glass jar, and then I dip each brush (just before the beginning of the ferrules), swirl in the palm of my hand, and then rinse until clear. I have found the key is to work the soap mixture into the bristles before rinsing.
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