Continue to rinse in new solvent until clean. Wash with soap and water and rinse thoroughly. Then just let the equipment dry. Do not pour the solvent down the drain . Rather, keep the used solvent in a sealed container and call your town or garbage pick-up service to see what your options are.
Most communities have a designated day for hazardous household waste disposal.
As far as leftover paint is concerned, do not pour it down the sink or in the toilet. Besides terrifying the guests when they flush, paint is hazardous to the environment and must be disposed of properly. If you don't want to keep your spare paint on hand for touch ups, think about donating it to a charity or Habitat for Humanity . If no one wants it, call your town or garbage pick-up service to see what your options are. In some areas, latex paint can be dried out and tossed in household garbage.