What was found
DURING CLIMB-OUT, CREW REPORTED "ODD" ODOR IN THE COCKPIT. CREW ELECTED TO PERFORM PRECAUTIONARY AIR RETURN, LANDING UNEVENTFUL. MX INSPECTED ACFT FOR FLUID LEAKS, ALL RESERVOIR LEVELS CHECKED OK, NO LEAKS NOTED. PERFORMED GENERAL INSPECTION OF FLIGHT COMPARTMENT AND CABIN FOR SIGNS OF SMOKE, NONE NOTED. MAINTENANCE SUSPECT RESIDUAL COMPRESSOR CLEANING/RINSE FLUID AS CAUSE OF ODOR WHEN FLUID EVAPORATED DURING ENGINE RUNNING. MAINTENANCE PERFORMED ENGINE GROUND RUNS, NO UNUSUAL SMELLS OR FUMES ASSOCIATED WITH ENGINE RUNS. AIRCRAFT RELEASED BACK TO SERVICE.