Looking for China Police Clearance Agency (Beijing)

Hi all,

Does anyone know a trusted and reliable visa agency who also can help to make China Police Clearance in Beijing? I used to work in Tianjin for over a year. I'm Indonesian and I'm living in Indonesia now. I need to make China Police Clearance (No Criminal Record) to be submitted for my US green card application.

Please, I need this urgent.
Thanks a lot.