When the team gets assigned to infiltrade an illegal chakra-trading ring, Lee goes to Sai for advice on how to blend in with the crowd. A nefarious neer-do-well keeps leaving the village bathrooms a filthy disgusting mess, so Tsunade appoints Lee's team as guards.
Keeping things clean is 
just basic common sense.
Dejar las cosas limpias es de sentido común.
Mantener las cosas limpias 
es algo de sentido común.
Manter as coisas limpas é algo natural.