Question: what can you wash your makeup brushes with?
Answer: Clarifying or baby shampoo. Add a dollop of baby or clarifying shampoo to a bowl of lukewarm water, then swirl each dirty brush around until you have worked up a lather, using your fingers if necessary. ... 
Unscented soap. Basic, unscented soap is really effective at cleaning makeup tools. ... 
Dishwashing liquid. ... 
Olive oil.