Thirteen people were sent to the Bladen County Hospital yesterday after a clean-up turned messy. Around 4:30 Wednesday afternoon, employees evacuated an Elizabethtown Burger King. Firefighters believe a maintenance crew accidentally mixed Drano with sulfuric acid in an attempt to unclog a drain. Employees noticed a foul odor in the air and some people developed symptoms, such as irritated eyes and lungs. Firefighters say everyone inside the restaurant was taken to the hospital as a precaution. None of the injuries were life-threatening. With a clean bill of health from the health department, the Burger King could open for business as early Thursday morning.