Abstract: A cylindrical tank arranged with its axis horizontal has an inlet at the top, at one end, arranged to direct drainage water mixed with oil onto the upper portion of a first sloping and transversely corrugated baffle member of less height than the tank but extending transversely across its interior. Spaced parallel baffle plates, also transversely corrugated and of less width than the tank, direct flow from the first baffle member upwardly and inwardly. A clarified water outlet extends to near the bottom of the tank at the other end and an oil withdrawing conduit is arranged to withdraw oil from the upper region of the tank near that other end. The tank is also provided with a sludge arresting baffle plate across its bottom and a sludge withdrawal access opening at its top.

Abstract: A restroom is automatically cleaned by moving a vertically disposed spray boom in a manner so as to generally track the interior periphery of the restroom enclosure to spray both the inner sidewall of the enclosure and the fixtures mounted therewithin with cleansing fluid, the fluid then being drained from the enclosure, after which any accumulated vapors are exhausted. Heated drying air is then passed through the enclosure to complete the cleaning cycle.