Dead bodies can become covered in what looks like soap. Technically known as adipocere (and sometimes also called grave wax), ...
He also donated to the Mütter the famous Soap Lady, whose corpse had become coated in a waxy, soap-like substance called adipocere. The medical history museum in Philadelphia is notorious for ...
your corpse can turn into a sort of wax mummy (the scientific name for it being adipocere). Tyler Durden in 'Fight Club' was not the first one to come up with the idea of using human fat to make soap.