Vendors interested in doing business with the city of Montgomery are asked to register through Bidnet Direct. Solicitations and Contracts.In this video, Matt shares all the necessary items to include in a kickass cleaning proposal that gets you the commercial contract. The Intent of the Invitation for Bids is to establish a Time and. Materials Contract(s) with a responsible Contractor(s) to complement. All proposals should be in a sealed envelope with, "SEALED BID Cleaning Services" clearly marked on the front, bottom left of the envelope.