Correction. Toxins are not living things that can be killed by heat. They are exudates secreted by an organism. They are semi-stable organic compounds that resist decomposition at some cooking temperatures. The bacteria that produce the toxins die almost immediately on exposure to heat and oxygen but their waste persists. You must clean the bowls. Boil the water 15 minutes or more and take no chances. Food poisoning is no fun and can be one of the worst forms of death!