Is then given and one is kept on file with the auctioneer. Each successful bidder is also charged a refundable cleaning deposit for each unit bought. The cash depost is collected at the time of payment and is attached to the company's copy of the bill of sale. After the buyer cleans the unit and is finished, they are then refunded the cleaning deposit. When all money has been collected from each successful bidder, the auctioneer then settles with your comany, issuing a.