Sergei Lukyanenko. Klutz (№ 31059)

They walked through the auditorium, where two sprightly old ladies drove on the dirty floor dirty rags periodically by dipping them in a bucket of dirty water. These old ladies live in all worlds and in all times. Some mages even suspect that is not the people, and the fairy of purity, a special breed of beings who are born already old, with a rag and bucket in hand. Their distinctive characteristics are the secret phrases and traditions that they recognize their own kind.
- Hodyut here any... ' said one old woman.