What was found
SMOKE ENTERED CABIN, APU AND BOTH ENGINES RUNNING WITH BLEED AIR ON. HEAVY MIST BLOWING OUT OF ALL VENTS, FILLED THE CABIN. HAD A DIRTY SOCK ODOR, NO BURNING OR ENGINGE EXHAUST. REMOVED & CLEANED WATER SEPARATOR IAW MM 21-51-00. OPS CHECKED GOOD, NO OIL IN SEPARATOR OR DUCTS. VERY HIGH HUMIDITY.