This page is where the public copy of bidder submissions are posted for public review. Bids must be submitted to the Finance Department of Purchases and Supplies, City of.The City of Charlotte will accept sealed proposals for janitorial services for City. Hall, the Charlotte Fire and Police departments. Proposals, affidavits, certificates and all appendices must be fully and properly filled out and executed. c. The Contractor shall employ only qualified supervisors and workers who are skilled in the performance of janitorial services. Personnel performing work.