What was found
NOTICE ODOR DURING TAKEOFF FROM PDX(QXE 2561 STAR LFT). CONTACTED MX CONTROL WHO INFORMED US OF ENGINE WASH THAT WAS NORMAL AND WOULD BURN OFF. HOWEVER AFTER 2 1 HOUR FLTS THE ODOR IS STILL PRESENT IN THE COCKPIT AND FORWARD PART OF THE A/C - LESS SO IN THE REAR OF THE CABIN ( AIR CONDITIONING PACKS –ONE INOPERATIVE ). REMOVED FROM SERVICE. RAN BOTH ENGINES ALTERNATING PACKS 1 AND 2. C/W FIM SUBTASK 21-20-00-810-009-A. NO ODOR NOTED. CLEARS DEFECT # 884238 PLACARDS REMOVED. MTX CNTL NOTIFIED. AIRCRAFT RETURNED TO SERVICE.