Step 1 - Dust or wipe off excess makeup left on your brushes after each use. Use a soft cloth or tissue and take care not to pull on the bristles too roughly. Build-up causes brushes to lose effectiveness and the bristles to break down.
Step 2 - Store your brushes in a case or bag to keep them dry and prevent dust build-up. Most brush kits come with a special case designed specifically for the brushes. If you don't have a kit, consider using an eyeglass case for storage.
Step 3 - Keep your brushes in a flat or upright position when storing to maintain their shape.
Step 4 - Clean makeup brushes regularly using a commercial cleaner or a combination of warm water and mild shampoo. Reshape the bristles after washing and lay flat to dry. Cleaning regularly inhibits bacteria growth and prevents bristle corrosion.