Wont get them all, but will get a good 90%. Easy thing to do actually.
Use the local law enforcement agencies. They arrest them at the workplace and if they cant show citizenship, the employer gets to pay a fine of about 5 grand for each illegal taken. Then, the employee gets to pay for the deportation also. about 70% of the fine goes to the local arresting law enforcement agency.
Wont cost the taxpayers a dime. Soon, you will see those employers taking real care not to hire ILLEGALS to work at their place resulting in artifical low wages.
The EMPLOYER gets to pay for the deportation.