Walls and ceilings of all rooms shall be kept clean and in good repair. All walls and ceilings of rooms in which food or drink is stored or prepared shall be painted, preferably in light color, or calcimined or otherwise finished at frequent enough intervals to maintain the surface in a clean condition. The walls of all rooms in which food or drink is prepared or utensils are washed shall have a smooth, washable surface up to the level reached by splash or spray. Evidence of splash or spray above the impervious surfacing is a violation of this section and shall be sufficient cause to require additional impervious surfacing. (Ord. 5212 § 1 (Exh. C), 1999; 1957 code § 4.02.130.)