Good question. [Right behind you! Izuku emerges from behind one of the piles of junk, looking extremely confused.]

From what I heard, the trash just started piling up when people left things here--that was a while ago, though. [He raps a knuckle on what looks like an empty, beat up fridge.] All Might and I...we cleaned this place up already. I'm not sure why it still looks like this.

[And in his heart, of all places.]