Big Brother called the pair to the Diary Room to tell them that they utter more obscenities than any other housemate.
They will win alcohol for themselves if they manage not to swear more than five times between them.
However, Alex Rose - being informed of their secret task - could win beverages for the whole house if she manages to make them swear more than five times.
These scenes will air during tomorrow night's eviction episode, which will see either Louise Cliffe or Faye Palmer leave the house.
Tonight's Big Brother, shown at 10pm on Channel 5, will feature Kim Woodburn's guest appearance on the reality show.