A father and his three sons sold chlorine dioxide, an industrial bleaching agent, as "Miracle Mineral Solution" through their "Genesis II Church of Health and Healing". They claimed that it could cure 95% of all known diseases, including HIV, cancer, and COVID. They are representing themselves in court and declined to give an opening statement, which the article notes as "an unusual legal tactic".
Depending on the definition of cure, I would argue that drinking bleach is a cure for any terminal illness. Drinking enough bleach will ensure that you won't die of whatever terminal illness you have!