If Stoop Kid never leaves his stoop, then where does he poop?

Fertilizer for his potted plants. Nothing goes to waste on the stoop. Also, since we are asking deeper questions regarding Hey Arnold I have a question of my own. Rhonda is rich as hell, so why do her parents send her to a school on the ghetto-ass part of town. PS 118 was not a school for the affluent.
 
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