If you are storing things like lawnmowers, washers, dryers, refrigerators, weed hackers, or leaf blowers, empty all the fuel, oil, and water out of them and clean them as much as possible. Not only is hazardous goods not allowed in storage but nothing stinks up a storage unit (or can damage your items when sitting for long periods of time with no use) like stale gas, oil, and water. HAZARDOUS AND FLAMMABLE GOODS ARE NOT ALLOWED IN STORAGE.