Best way to clean a used boar brush?

[Ron R]

I just use hair shampoo recommended by Yaqi brush mfg. It seems to work well in my badger & boar brushes when I received them brand new.

 

[Steve56]

Why not use a brush soap? There are many of them? Alternatively, a pure coconut oil or cream will work well and rinse clean. As long as it doesn’t have a lot of excess fat. MdC comes to mind.