Makeup Buildup
Makeup brushes get used for all different types of makeup; from eyeshadow to liquid foundations. Overtime, that makeup builds up and collects and cakes up in the bristles, making it difficult to work with blending in makeup the next time you use them.
Bacteria
Gross, bacteria! Yes, bacteria thrives in your makeup brushes after each use of them! Leading to acne, uneven makeup and possible skin infections. Just imagine that on your skin!
Sponges Hoard Bacteria
Beauty Blenders and makeup beauty sponges all hoard lots of bacteria. They are a sponge, so they soak up whatever liquid you put on them, and they collect whatever bacteria that's on your face and give it the opportunity to thrive and grow. Be sure to wash them thoroughly at least once a week.
Bristle Health
Keeping your makeup brushes ensures the health of the bristles of your makeup brushes. Makeup build up collecting in the bristles over time can damaged the bristles, especially with liquid foundation, bronzers, blushes, contouring, etc.
Proper Cleaning
A lot of people who use makeup brushes and sponges are unaware of which cleanser to use. They're are so many on the market these days! I have one cleanser that I love and trust with cleaning my makeup brushes and it is inexpensive!
Real Techniques Makeup Brush Cleansing Gel ($9.99)
I've used this cleansing get for YEARS on my brushes. It's lightly scented which doesn't bother my face or eyes, it's a gel formula, so it doesn't run all over the place, easy to work with, gets the job done, it's expensive, and it's sold at many stores such as: Target, Walmart, Ulta, CVS, and Walgreens.