Sewer smell
Kinda going to be an unpopular idea but...

Entering the sewers should make the smell cling to your body with its own special smell kinda like the smell of the park, so simply showering all of it off wouldn't help you out, because y'know, that kind of smell is going to stick to your clothes easily.

It definitely gets you filthier than anything else I've seen so far, but a notable smell would make a lot of sense! I can already hear the cries of displeasure when someone rolls into a bar with eau de sewer wafting around them.