A B737-400 ARRIVED WITH L #2 DOOR AND R #2 DOOR WINDOWS FOGGED AND RESTRICTING VISION. CAPT REFUSED AIRPLANE.

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WHILE AWAITING FOR FLT IN OPS; HEARD INBOUND FLT (ACFT A B737-400) CALL IN WITH A MAINT WRITE-UP THAT BOTH L2 AND R2 DOORS (AFT ENTRY; AFT SVC) WINDOWS WERE FOGGED. THESE WINDOWS ARE USED BY FLT ATTENDANTS TO 'ASSESS' CONDITIONS OUTSIDE PRIOR TO OPENING DOORS IN AN EMER. THE WINDOWS ARE NON-MEL ITEMS. UPON ARR OF ACFT; I SPOKE TO THE FLT ATTENDANTS AND PERSONALLY CONFIRMED FOR MYSELF THAT THE WINDOWS WERE UNUSABLE. THE INITIAL INSPECTION BY A MECH ELICITED THE COMMENT THAT HE COULDN'T SEE OUTSIDE. OVER AN HR WENT BY WHEN 2 MECHS APPEARED WITH A 'SIGNOFF' USING AN 'ENGINEERING AUTH' ALLOWING THE AIRPLANE TO CONTINUE. I READ THE AUTH WHICH INCLUDED A CHKLIST OF SORTS THAT ATTEMPTS TO OBJECTIVELY RATE THE USABILITY OF THE WINDOWS. THE ENGINEERING AUTH SEEMED TO STRESS BEING ABLE TO LOOK FROM THE OUTSIDE-IN; SO THAT ANYONE OPENING THE DOOR FROM OUTSIDE COULD SEE THE RED SAFETY STRAP. FROM A CREW STANDPOINT THE WINDOWS WERE STILL UNUSABLE. AFTER DISCUSSIONS; I CALLED THE FLT OPS DUTY OFFICER CAPT. AFTER OUR DISCUSSION I DECIDED TO REFUSE THE ACFT UNDER THE ENGINEERING AUTH AND ASKED CAPT TO CALL AND EXPLAIN MY POS. THE PLANE WAS THEN TOWED OFF THE GATE TO BE WORKED ON. APPROX 5 HRS LATER; THE PLANE WAS RETURNED. 1 DOOR HAD BEEN DISASSEMBLED; CLEANED AND REASSEMBLED AND THE OTHER DOOR RELEASED UNDER THE ENGINEERING AUTH. AFTER NEARLY 7 HRS OF SITTING ON THE GND; THE MOISTURE DISSIPATED AND THE WINDOWS WERE USABLE. BY NOW; ALL PAX WERE ACCOMMODATED ON EARLIER FLTS AND I ELECTED TO TAKE THE ACFT; SANS PAX AND ONLY THE CREW; BACK. UPON LNDG; IT WAS NOTED THAT BOTH REAR WINDOWS HAD FOGGED AGAIN AND WERE UNUSABLE. A WRITE-UP WAS RECORDED IN THE MAINT LOG. INTERESTINGLY; WHILE TALKING; I ASKED THE QUESTION; 'EVEN IF I DEPART WITH A USABLE WINDOW UNDER AN ENGINEERING AUTH; WHAT ARE MY ASSURANCES THAT THE WINDOWS WILL BE OK FOR LNDG?' MAINT CTL SAID THEY WERE CONFIDENT THAT THIS WOULD NOT HAPPEN DUE TO DIFFERENT CONDITIONS SUCH AS HUMIDITY AND PRESSURE.