Clean immediately after use – paint thinner or kerosene with bristle brushes; soap and water with nylon/polyester brushes.
Use a brush comb to clean and straighten the bristles.
Do not soak your brushes for extended periods of time. They will lose their shape if you do.
If possible, store your brush by hanging it. Do not store a brush on its tips. This will curl the working tip of the brush rendering if useless.