Sewage Backup Cleanup and Water Damage Restoration in Oak Park, Michigan. A hidden main sewer line failure in the crawl space went undetected for ~6 months, releasing raw sewage and creating a dangerous Category 3 contamination throughout the home. Strong odors made the property unsafe. Advance Restoration responded with full PPE, strict containment, and professional remediation protocols to clean up the sewage and then completed mold remediation and full reconstruction of t