I clean my brushes once a week, but I also use shampoo/conditioner on my hair versus water only, so you definitely might need to clean them more often than that depending on how much oil your scalp produces. If you're particularly oily, every day or every other day, but if you aren't, I'm sure you can go a few days between washing the brush and it should be fine. Best advice, trial and error. Try to see how long you can go between washing it before it starts to look a little...off, and let that be your judge.
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