How do you soften stiff painted fabric?

To soften stiff painted fabric, you can soak it in a solution of warm water and a gentle fabric softener for about 30 minutes. After soaking, gently agitate the fabric to help loosen the stiffness, then rinse thoroughly in cold water. Allow it to air dry or tumble dry on a low setting, and consider lightly ironing it on a low heat to further soften the painted areas. Always test on a small area first to ensure the paint doesn’t react adversely.