Janitors, Book 4: The Strike of the Sweepers

The stakes have never been higher, and you have never seen squeegees do this before! It is a wild and slightly unsanitary ride as Spencer, Daisy, and the rebels find themselves chased by Mr. Clean's new and terrifying breed of toxite--the Sweepers. Time is short. With the fabled Manualis Custodum in hand, Spencer must figure out how to summon the founding witches if they ever hope to mop up and save education.