WE LIVE ABOARD AND BOTH OF US SMOKE PLUS PEOPLE WHO COME ABOARD.THE BOAT IS NEW[99]AND WE HAVE A PROBLEM WITH THE OVERHEADS BEING CLEAN,KITCHEN AREA INCLUDED. I HAVE BEEN BOATING FOR 30 YEARS AND NEVER HAD THIS PROBLEM.IN SOME AREAS IT CLEANS WITH ANY CLEANER INCLUDING PLAIN WATER.HOWEVER,SOME AREAS IT WILL NOT COME OFF AND REMAINS BROWNISH.I TRIED ACETONE IN A SECLUDED SPOT AND IT LOOKS BAD.I HAVE A GOOD HEATING SYSTEM,4 ZONE TO STOP CONDENSATION,AND I ALSO USE A DEHUMIDIFIER.I THINK THIS HAS STOPPED THE MOISTURE BUT WHAT DO I DO TO CLEAN THE OVERHEADS SHORT OF SPRAY PAINTING.