(a) All vehicles under this article shall be kept in a clean and sanitary condition and shall be thoroughly cleaned each day they are so used.
(b) No person shall permit stale food, decaying matter or any other waste material or product to accumulate in or on any such vehicle while it is so used.
(c) If unwrapped foodstuffs are transported in any such vehicle such goods shall be carried in a portion or compartment of the vehicle which is screened and protected against dust and insects. (1963 Code § 14.204)