Ace is one of hundreds of commercial grease hauling companies in the United States. Each morning, crews drive out to their customers—mostly restaurants—and use vacuum trucks to suck up stored grease. Sometimes the grease is kept in large outdoor bins. More recently, though, many restaurants have started using automated traps that store grease as it leaves a fryer—up to 225 pounds. “A lot of people like them to prevent theft and to not have slips, falls, burns, and injuries, and save on workman’s comp,” he says. Either way, the second the oil drum is full, Ace rushes to collect it.