As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAKEOFF THRUST APPLICATION, SLIGHT ODOR WAS NOTICED SIMILAR TO HOT PACK. ODOR BECAME STRONGER AFTER TAKEOFF. VERY LIGHT SMOKE APPEARED IN CABIN. RAN BOTH ENGS, VERIFIED SMELL COMING FROM ENGINES DUE TO A CHEMICAL ENG WASH ON RON. SMOKE WAS FROM A/C SYSTEM COLD AIR. OK FOR SERVICE.