A CL65 ON TKOF CLB DECLARED AN EMER AND DIVERTED DUE TO LAVATORY SMOKE WARNING AND STRONG ODOR. CAUSED BY ENG COMPRESSOR CLEANER.

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I WAS THE PIC ON FLT ABCD ON FEB/FRI/05; ZZZ-ZZZ1. UPON DEPARTING ZZZ; AFTER LIFTOFF; RECEIVED A MASTER WARNING OF 'LAVATORY SMOKE' AS WELL AS SMELLING A STRONG ODOR. WE TOLD TWR WE HAD TO RETURN TO THE FIELD AND TO STAND BY. WE SPOKE TO THE FLT ATTENDANTS. THEY HEARD A WARNING BELL AND THEY TOO SMELLED THE SMOKY ODOR. WE WERE HANDED OVER TO DEP AND TOLD THEM THE SIT. REQUESTED AN ALT AND HDG SO WE COULD PERFORM CHKLISTS. WE DECLARED THE EMER. THE 'LAVATORY SMOKE' INDICATION REMAINED ON FOR 5-7 MINS AND THEN DISAPPEARED. WE RETURNED TO THE FIELD. MECHS BOARDED THE ACFT AND TOLD THEM WHAT HAPPENED. THEY TOLD ME THAT THEY HAD COMPRESSION-WASHED THE ENGS DURING THE NIGHT SHIFT AND THAT WAS WHAT PROBABLY CAUSED THE 'LAVATORY SMOKE' INDICATION. THEY SAID THEY WANTED TO TAKE THE ACFT AND RUN A HIGH SPD TEST AND WOULD LET ME KNOW WHAT THE RESULT WAS. I ASKED THE MECH IF HE WANTED ME TO WRITE UP THE PROB. I WAS STARTING TO DO IT AND HE SAID NOT TO WORRY ABOUT IT AND THEY WOULD TAKE CARE OF IT. MYSELF AND MY CREW WENT INTO THE TERMINAL. ABOUT 15 MINS LATER; I RECEIVED A CALL FROM MAINT CTL IN ZZZ2 STATING THAT I DID NOT 'WRITE UP' THE PROB. I HAD THIS SIMILAR SIT OCCUR 3 1/2 YRS AGO AND WE RETURNED TO FIELD WITHOUT DECLARING AN EMER. THE 'LAVATORY SMOKE' INDICATION ILLUMINATED AND THEN DISAPPEARED. THERE WAS NO ODOR. AFTER RETURNING TO THE FIELD; I HAD CALLED MAINT CTL AND EXPLAINED WHAT HAPPENED. I WAS INFORMED THAT THERE WAS NOTHING TO WRITE UP BECAUSE THE MESSAGE DISAPPEARED. I THOUGHT THIS WAS THE SAME TYPE OF SIT AND AFTER SPEAKING TO THE MECH AND HE KNEW WHY THE 'LAVATORY SMOKE' WENT ON. THE ACFT WAS SIGNED BACK INTO SVC AND FLEW THE FLT TO ZZZ1. I SPOKE WITH OUR 2 CHIEF PLTS IN ZZZ2. I WAS TOLD THAT I HAD TO FLY BACK TO CLT AND MEET WITH OUR EAST COAST CHIEF PLT FOR TRAINING. THE COMPANY SELF-DISCLOSED TO THE FAA.