Even your beauty tools need a spruce-up now and then. When’s the last time you cleaned your makeup brushes? If the answer starts with “umm…” or is simply “never,” you need to get to a sink asap. In reality, you should be thoroughly cleaning all your brushes and tools at least once a month to prevent bacteria buildup that can cause infections or irritate your skin, lips and eyes. Properly cleaning your brushes is easy – just rinse under luke warm water and use a cleanser or gentle shampoo.