There are a couple of brochures that can help you figure out if you are eligible for expunging your criminal court record. The first brochure was created by the Director of State Courts Office of Court Operations. Expunging Circuit Court Records Brochure (PDF)
The second brochure is from the WI Department of Justice Crime Information Bureau. Removal of CIB arrest information (PDF)
WI Governor Pardon's website
WI State Law Library resources for Expunging Records, Removal of Arrest Records, and Governor's Pardons.