Detergent surveyed the scene, taking note of any possible clues. He noticed that the back door was slightly ajar, and there were muddy footprints leading from the door to the frying pan. Detergent's detective instincts kicked in, and he knew he had to follow the footprints.
The footprints led Detergent to a nearby park, where he found a homeless man sleeping on a bench. He woke the man up and asked him if he knew anything about the poop in the frying pan. The homeless man denied any involvement, but Detergent noticed a small piece of paper sticking out of the man's pocket.
He pulled out the paper and discovered it was a receipt from the diner, with a note scribbled on the back that read, 'Thanks for the dinner, Smith.' Detergent knew he had found his culprit.
He brought the homeless man back to the diner and confronted him. The man, whose name was Charlie, confessed to the crime. He explained that he had been hungry and saw the back door of the diner was unlocked. He snuck in and cooked himself a meal, but before leaving, he had to use the bathroom and saw the frying pan.