“Clean Sewer Humor” or "Soap Opera"

http://www.usatoday.com/money/industries/environment/2011-04-27-clogged-sewers_n.htm?csp=hf

Environmental engineers at North Carolina State University say that the sludgy residue built up in sewer lines that sometimes causes overflows is actually a chemical soap build-up.  But at least this finally means a bath for the alligators.

The most unexpected side-effect of the presence of this sewer soap: more slippery rats.