In every auto trailer camp where automobiles or trailers are washed or are to be washed, there shall be installed a washrack and no such washing shall be done except on such washrack. All washracks shall be paved with a continuous concrete floor slab not less than 15 feet by 25 feet by four inches thick and all parts thereof shall slope toward a drain so connected as to dispose of all waste water without nuisance or creation of an unsanitary condition.
('71 Code, § 1181.23) Penalty, see § 101.99