Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Maintenance
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Human Factors
Upon arrival at the cockpit; I noticed a bottle that seemed out of place. Upon examination; the bottle was glass cleaner that was labeled as HAZMAT. I removed the item from the cockpit and noticed a spill in the compartment. I read the label and noticed that the label stated 'WARNING: Flammable liquid and vapor...' I notified the Captain and he called Maintenance Control and made a logbook entry. Maintenance Control assigned a Technician who cleaned the spill and made a corrective entry in the logbook. Given the size of the spill; I can assume that the previous crew unknowingly flew the aircraft with a HAZMAT spill in the cockpit.An unknown person must have left the bottle behind after using it in the cockpit. The hazardous item and spill went undetected by the previous crew(s).It's important to use the correct cleaning agents on the aircraft. It's even more important to ensure (and have a procedure) to make sure hazardous items are removed from the aircraft. I self-rated the risk rating as HIGH since the aircraft had presumably flown with a HAZMAT spill that was undetected by a previous crew.
Air Carrier First Officer reported a liquid spill from a bottle of glass cleaner labeled as Hazmat which was inadvertently left in cockpit.