Scrape as much paint as possible from the paintbrush. Use a paintbrush cleaning tool to do this, or wipe the brush with a disposable rag. Work from the handle area to the tip.
Mix 1/2 cup of fabric softener in about 3 gallons of water.
Move the paintbrush back and forth in the fabric softener mixture until all paint is off the brush. Don't let the brush bristles touch the bucket bottom.
Pat excess water from the paintbrush with a disposable rag.
Hang the paintbrush by its handle to finish drying.
Clean excess paint from the paintbrush. Use a paintbrush cleaning tool to do this, or wipe the brush with a disposable rag. Work from the handle area to the tip.
Pour paint thinner or mineral spirits into a metal bucket to a depth of several inches.
Swish the paintbrush through the paint thinner or mineral spirits until all paint is removed from the brush.
Pat the brush dry with a disposable rag.
Hang the paintbrush by its handle to finish drying.