How should I properly wash an acrylic paint brush to ensure its longevity and maintain its quality?

To properly wash an acrylic paint brush, first rinse it in warm water to remove excess paint. Then, use a mild soap or brush cleaner to gently clean the bristles. Avoid using hot water or harsh chemicals, as this can damage the brush. Finally, reshape the bristles and let the brush air dry completely before storing it upright to maintain its quality and longevity.