"You know what to do" - Tony Stark to as he initiates the "Clean Slate" protocol.
The "Clean Slate" protocol was an order given by Tony Stark to destroy his suits. The order was initiated shortly after the battle with Aldrich Killian, he did this to prove to Pepper Potts that his suits are not a distraction from her as she thought. It resulted in the destruction of 33 suits, all the suits created after the Mark 7 and before the Mark 42.