Before I start painting, I will use clean water to wet my brush. I use my fingers to squeeze out the excess water from the hair like this, and then I rest the brush on a clean paper towel. I will do the same thing when I finish a painting.
It is important to take good care of our brushes. Cleaning them each time you used them is a good practice. This will keep your workstation clean and extend the life of the brushes. To store my brushes after they are dried, I use this waterproof nylon case and keep them organized.