What was found
DURING CLIMB-OUT FROM KMEM, THE COCKPIT AND CABIN FILLED WITH SMOKE. THE FLIGHT CREW DONNED O2 MASKS, COMPLIED WITH THE QRH AND DECLARED AN EMERGENCY WITH ATC. AN OTHERWISE NORMAL APPROACH AND LANDING WAS MADE. THE AIRCRAFT WAS STOPPED ON THE TAXIWAY AND CFR INSPECTED THE AIRCRAFT. THE PASSENGERS WERE REMOVED AND TRANSPORTED TO THE TERMINAL ON BUSES. MAINTENANCE DETERMINED THAT THE CAUSE OF THE SMOKE WAS RESIDUAL FLUID FROM THE PREVIOUS NIGHT'S COMPRESSOR WASH. THE AIRCRAFT WAS RUN UP TO TOGA POWER WITH THE BLEEDS ON. NO FURTHER SMOKE, FUMES OR VAPORS WERE DETECTED. THE AIRCRAFT WAS RELEASED FOR SERVICE. PINNACLE AIRLINES IS REVIEWING THE COMPRESSOR WASH PROCEDURE TO DETERMINE IF THE PROCESS SHOULD BE MODIFIED TO PREVENT FUTURE EVENTS.