Some buildings around campus don't have an obvious pin to match, you are free to use whichever service locations fits best.
Residences: Dobbs, McTyeire Hall, Black Student Alliance (22)
Woodruff Residential Center
Request a pickup and drop dirties by 1p in the drop spot located in the ground level (3rd floor) hallway outside the main office door, down the left hall. You'll see a cart below the roll-up window.
Sorority Lodge (11)
Request a pickup and drop dirties by 1p in your drop spot located just inside your lodge's front door in the lobby/front room. Best to make sure your bag is visible from the front entrance.
Drop dirties by 1p in drop spots, located either by front or back door (check with your house).