Oil-based paint should be removed in a bucket or container with mineral spirits (petroleum distillate), rinsed in tap water and then washed with soapy water. Rinse the brush until the water runs clear.
Keep alkyd paint containers closed when not in use. Do not transfer contents to other containers for storage or disposal. In case of spillage, absorb with an inert material such as sand or kitty litter. Dispose of contaminated absorbent, container and/or unused contents in accordance with local, state and federal regulations.