This is the juvenile expungement packet provided by the Clerk of the Court (which includes the forms to actually file a juvenile expungement petition). Click HERE to download.
The following are some useful resources to help you better understand the juvenile expungement process:
Reboot Your Life: A Brochure about Juvenile Expungement
WBEZ has been reporting on juvenile justice issues in Illinois all year. Their terrific series Inside and Out is worth checking out in its entirely. However, two reports specifically address the issue of juvenile expungement.