What was found
AIRCRAFT HAD A BAD ODOR IN COCKPIT AND CABIN. NO VISIBLE SMOKE IN EITHER, RECIRC FAN TURNED OFF, SMELL WAS REDUCED, BUT NOT COMPLETELY. AIRCRAFT RETURNED TO DTW. MAINTENANCE RAN AIRCRAFT AND VERFIED ODOR, SUSPECT COMP WASH FLUID. RAN AIRCRAFT WITH BLEEDS ON FOR 15 MINUTES AND SMELL WENT AWAY. ALL CHECKS GOOD.