Latex paint must be dried out or solidified prior to disposal. Use cat litter, oil dry, sand, or other suitable material to dry out the paint or allow it to air dry. Once the paint is solid, leave the lid off the can and set it out at the curbside for collection with your regular refuse. If you are unsure whether the paint is latex (water-based), refer to the clean-up instructions on the paint can. Latex paint can be cleaned up using soap and water.