What was found
JUST PRIOR TO APPROACH WHILE DECENDING OUT OF 6000' WE BEGAN TO NOTICE A DIRTY SOCK SMELL. TURNED OFF PACK 1 AND THE SMELL DIMINISHED. A MINUTE LATER THE FA CALLED AND SAID THY HAD A SIMILAR SMELL IN THE CABIN. WE TURNED PACK 1 ON AND 2 OFF. SMELL CAME BACK IN COCKPIT. FADED 5MIN LATER. -PERFORMED DECONTAMINATION PROCEDURE FOR PACK 1+2 IAW AMM 21-00-00. WO 34853 EO 7100-2301, TI 2100-2002 NEO, EA 7200-2406. REF LP 3572845-2, 3572486-1. NO ODOR DETECTED. AC OK FOR CONTD SVC.