What was found
PILOT CALLED & STATED STRANGE SMELL IN CABIN & FLIGHT DECK. THIS WAS A STRANGE ODOR TO THE CREW, NOT A BURNING SMELL & NO SMOKE. INSPECTED THE ENGS, TRANSMISSION, BLEED AIR SYS AVIONICS BAY & INTERIOR OF CABIN & FLIGHT DECK. OPERATED ENGS AT FLY FOR SEVERAL TIMES WITH BLEED AIR & HEAT ON AT HIGHEST SETTING. THE SMELL HAD DISSIPATED, ACFT RELEASED FOR SERVICE. POSSIBLE CAUSE COULD BE RESIDUAL COMPRESSOR WASH AFTER TWO DESOLATION RINSE