I doubt the walls in the only place they live, aside from complete fumigation of the entire house you'd likely have to get rid of any furniture that's infested. Once they take up residents in something like a mattress or furniture I'm not sure there's any practical way of getting rid of them, fumigation of furniture might be possible but I you'd never really get rid of all the chemicals. I read the Wikipedia entry and apparently they can't cross petroleum jelly, which might be a stopgap measure. There's a couple of other tips in there, you might want to read it.