Madagascar Hissing Cockroaches

I'm "fostering" a colony of hissers right now. I worked at a science museum, then the museum closed due to funding issues (temporarily, we hope), and somebody needed to take the museum's educational cockroaches home to care for them during the closure. Nobody wanted them, so I took them.

For the most part, they're super easy. However, their tank is starting to stink, so it's time to change the bedding. The problem is - there are babies hiding everywhere throughout the bedding! Does anyone have any tips for cleaning the tank without sending baby hissers loose through my house (or my backyard)?