Can I clean my makeup brushes with liquid soap or detergent?
Cleaning makeup brushes
I wouldn't recommend using soap as it could damage the brushes hair by drying it out. I also think that soap won't remove all the makeup anyway. I use MAC's makeup brush cleanser.
You can use fairy liquid as it cuts through grease and cleanses well but I would recommend using an alcohol based cleanser which will kill any bacteria or use a mixture of both, clean them with fairy liquid first and then rinse them with the alcohol based cleanser. xx
I use Philosophy's Purity to clean my brushes. Leaves them very clean and super soft!