A B737-300 FLT ATTENDANT RPTS A LAVATORY OVERFLOW CONTAMINATED THE AFT ACFT FLOOR AREA AND WAS INSUFFICIENTLY CLEANED FOR SANITARY PURPOSES.

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INBOUND CREW TOLD COACH FLT ATTENDANTS THAT AFT LAVATORY OVERFLOWED WITH FECES AND URINE. DO NOT KNOW EXTENT OF CLEAN-UP PERFORMED. GOT IMPRESSION FROM FLT ATTENDANTS THAT A SUPERFICIAL SURFACE CLEANING WAS DONE -- NOT SUFFICIENT ENOUGH TO FEEL AREA WAS SANITARY. FLT ATTENDANTS SAID CAPT MADE THEM TAKE FLT. FLOOR WET; STICKY AND SEATBELTS HANGING FROM JUMPSEATS ONTO FLOOR CONTAMINATING THEM. WE WANTED NEW PLANE OR CLEAN-UP. WERE TOLD PLANE TO BE TAKEN OTS AT END OF TRIP SEQUENCE. WE WERE UPSET. IF BAD ENOUGH TO TAKE OTS; THEN WHY GOOD ENOUGH TO FLY!? FELT COMPROMISING OUR HEALTH AND PAX HEALTH TO MAKE MONEY BY USING FLT FOR REST OF ITS 'WORK DAY.' DUE TO PRESSURE AND GUILT FOR DELAYING FLT; WE ACCEPTED FLT WITH SEATBELTS REPLACED AND FLOOR SPRAYED WITH SANITARY SPRAY. FLT ATTENDANTS OPENED UP INFECTION KIT AND LAID DOWN SANITATION BLANKET AND USED DUCT TAPE FROM HANDCUFF/SECURITY BOX TO TAPE BLANKET DOWN. TOILETS HAD NOT BEEN DUMPED AND TOOK FILTHY LAVATORIES TO SFO SMELLING FROM OLD TOILET WATER NOT DUMPED. WATER IN TOILET YELLOW/BROWN.