Navy Blue Runechalk

Chalk One Up. As an action, you can use this chalk to draw a simple symbol. A creature must have an Intelligence score of at least 6 to draw these symbols. Identical symbols do not stack. You can draw up to 20 symbols with this chalk before it is completely used up.
  Broom on any surface. Instantaneously cleans a dirty surface of 5ft. by 5ft.
  Closed eye on armor. Do not suffer disadvantage on Stealth checks caused by wearing armor that normally imposes it for one hour.
  Cross on footwear or feet. Steps leave no tracks for 1 hour.