Cleaning your make up brushes is ESSENTIAL to maintaining a clean and even make up look as well as a clean complexion. You should be cleaning all of your make up brushes AT LEAST once a month. You don't have to go out and buy expensive makeup brush cleaners either. Some girls simply use a face wash soap, I prefer to use Johnson's Baby Shampoo.

I've found a good website, http://www.sassybella.com/2011/03/how-to-clean-your-makeup-brushes/, that lists 4 easy steps to cleaning your brushes:

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"HOW TO CLEAN YOUR MAKE UP BRUSHES – IT’S EASY!

What you will need:

• Every single brush your your collection (blush, face, foundation, eye shadow, lip liner, eye liner, kabuki and etc)
• A foaming face wash (we used a Dove one)
• Warm water & the bathroom sink for about 20 minutes
• Old-ish towels

4 Easy Steps to clean makeup brushes:

1. Dampen the bristles of the makeup brush with warm water.
2. Add a small amount of face wash to the brush bristles and lather up.
3. Rinse the bristles of the brush under running water until the water turns clear. Inspect the face brushes thoroughly. If your brush is extra dirty like mine, keep following step 2 & 3 until there are no clumps visible.
4. When all brushes are clean, run the bristles across the towel then lay them flat across the towel to air dry. Do not dry them standing up.

Easy!

*Make sure you don’t dampen the whole make up brush or leave brushes soaking in water. It will loosen the glue keeping the bristles in the brush over time.

Why haven’t we reccomended a brands makeup brush cleaning product?

We’ve tried a few brands that have a makeup brush cleaning soap/wash, but they never lather up as nicely and they don’t was as nicely as a good soapy/bubbly face wash.

Meanwhile, the brush cleaning sprays for an antibacterial spritzes in between real washes… well where does the build-up go? In my opinion, the build-up is still there (and the spray only adds to it) but the product stuck to the brush bristles are sanitised. At best.

Nothing beats a good wash. Would you eat off a plate that had just been sprayed with an antibacterial spray?"


Source:
http://www.sassybella.com/2011/03/how-to-clean-your-makeup-brushes/