In its time, the Spanish influenza pandemic saw some bizarre "cures" being attempted - which is understandable, given that medical science of 100 years ago was nowhere near advanced as it is now.
Perhaps, though, the most bizarre one of the lot was often recounted by my gandparents, who lived on the adjacent property to where this incident took place. A local farmer decided that the best preventative to catching the flu was to take a swim through the sheep dip, which he proceeded to do - and I never thought to ask the grandparents if the guy subsequently caught the flu or not!
Others maintained that smoking was a good preventative measure (imagine!)
Some doctors, out of desparation,resorted to the use of such toxins as strychnine and digitalis. Self medication resulted in widespread cases of asprin poisoning, with the commonly held (though mistaken belief) that "if two are good, then four are even better" type of approach being tried.
Two decades into the 21st Century, though, it is rather unbelievable that somebody should even have to ask if internal use of disinfectants was a possible treatment for COVID-19.