We keep ours out in the garage. Let's just say that it didn't get emptied last week, and there was no bag in it (and it gets used a whole lot more now that I'm home with the boys on summer break).
It was horrible as it was, but on the verge of taking on a whole new dimension of nastiness. I think I just used a whole can of Lysol on it. I'm going to have the heeby-jeeby's all day long.