Trash and scraps appear on the Camp after the Knight has eaten a dish.
They can be cleared away by a Knight with the use of energy, or for free by a LadyAdmirer with one or several clicks. The Lady Admirer receives a reward for clearing the trash (Lady reward: coin, XP, glory, energy, Love, Helmet, Horse & Heraldry items), and it leaves behind a treasure chest for the Knight (Knight reward: ???).
If you have a sent request to help clean up, but upon arrival at the Knight's Camp there is no trash, then someone else cleaned it up. Any of a Knight's admirers can clean up on their Camp, and cleanup requests are not personalized.