Street cleaner
noun-
a person whose occupation is to clean streets.
Of all the jobs Sherlock had had to do when he was undercover, the time he had to pose as a street cleaner was the worst.
He was stuck for over eight hours trailing the garbage driver, and he worked just about the most he ever had for a case. After grueling hours in the long hot sun, Sherlock finally caught the driver in the act and snapped a photo.
The police converged on them minutes later.
"Oh God Sherlock, you reek!"
DI Lestrade had the time of his life, carpooling an extremely grumpy detective back to Baker Street.
At the door, he said,
"Please do us all a favor, and take a bath will you?"
Sherlock snarled at him and slammed the door behind him. John was very surprised to see a despondent, dirty, Sherlock walk in the door a minute later.
"I really shouldn't have let you stay home on that one," Sherlock muttered as he trudged to the loo.