Walking away from a storage auction is not the easiest feat once you've won a few units. You can expect to have to throw away a lot of your winnings and even the things you decide to keep you then have to haul off usually within 24 to 48 hours. You can imagine that someone, somewhere, when faced with this project just took what he wanted and ran. Makes sense, right? That's the easy way out, right?
Thanks to people like that cheating them in the past, most facilities will ask that you pay a refundable cleaning deposit. It only makes sense, and it's only fair. The storage facility already got cheated out of their money from the delinquent tenant, so the last thing they want to do is clean up your garbage. Most facilities charge fifty to one hundred dollars that will be returned to you only in the event that you clear out your unit with 24-48 hours of having won it. The facility will make the specifics clear once you've arrived, or you could always call with questions. You can assume what the facility expects from you, however: clear out your unit completely. Most facilities want the unit swept completely clean of any debris, too.
It can be a lot of back breaking work to clean out a unit, so this is why it's so important to be a smart bidder. Do not bid on a unit that looks like a bunch of garbage--chances are, it's just a bunch of garbage, and you'll be in for a long 48 hours ahead of you.
Just expect to pay a fine if you don't have a good escape plan. After all, storage auctions weren't meant for the faint of heart.