Is your stylist asking you to clean your makeup brushes every month? It is necessary to clean them every week (not month). They attract a lot of germs and dirt within a short period of time and it is absolutely imperative on your end to clean them with gentle baby shampoo and warm water. If you are waiting a month for the next wash then you are actually allowing a lot of germs to contaminate your skin. You should be extra cautious about the cleaning regime if you have sensitive skin or skin conditions like acme or eczema.