Your brushes and rollers hold on to a lot of paint, and if you just start washing them after a job then all of that paint is going to go into the water. Reclaim as much of that paint as possible by dragging your brushes against the inner lip of a paint can or other container multiple times before you get ready to wash. If you’ve got paint-filled rollers, you can use the curved portion of a multi-purpose paint tool to scrape and squeeze paint out of the roller, as well.