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My bad...I the time I wrote it, I was thinking Baking Soda (rather than Borax)...:)

Hi Ryan,
Sometimes people ignore rinsing their brushes well. This, over time, will lead to build up (I haven't had this problem long enough to know, so I am speaking theoretically here).

For...

I do wash mine. A dab in Borax, followed by gentle detergent rub, followed by a vinegar (20%)/Glycerin (few drops) solution. Rinse and Viola...you are good to go.