HOW TO CLEAN A PAINT BRUSH. (VIDEO)
Cleaning Water Based (latex) Paint From your Brush.
To start, run the brush under warm water to rinse off the majority of the paint. Next, lather the brush with a mild soap to help aid the removal of the remaining paint.

The brush comb is used to clean the paint brush handle. With this tool,
painters will be ready to do battle with heavy paint build-up.
If you do not have a brush spinner handy, you can place the paint brush between both hands. Then proceed to rub your hands back and forth like you are trying to warm up on a cold winter night.