It costs almost nothing to make them self deport. Make it illegal to hire them, enforce it, and they go home.
Easier said then done. Yes, shut off the job magnet. But there is an underground economy and a familial network that will sustain many of them. We need to enlist the help of state and local enforcement to enforce our immigration laws. Every traffic stop or minor crime can be used to catch and deport them. No more revolving door. No more catch and release.