Best way to clean shaving brushes?

Borax for natural hair, as it is alkaline (basic), while vinegar or citric acid is acidic and could therefore be too aggressive. Furthermore, borax has a disinfectant effect and and some manufacturers explicitly warn against using citric acid.

As for synthetic brushes, I first use dishwashing detergent and then baking powder.

Both work like a charm. Hard water here. :)
 
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