What was found
FLT#699, LGA-MCO. #3&4 INFLIHT CREW REPORTS A VERY STRONG CHEMICAL SMELL IN AFT GALLEY PRODUCING A METALLIC TASTE IN THE MOUTH, SORE THROAT AND HEADACHE OCCURED ON DESCENT FROM 4500 THROUGH ENGINE SHUTDOWN AT GATE. #3 SEEKING MEDICAL ATTN. ACCOMPLISHED TASK CARD A320-21-00-00615-804-A. LEVEL C DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM (ECS), A/C OK FOR SERVICE.