N.C. Gen. Stat. § 106-249: Receivers of products to clean utensils before return.

Every person, company, or corporation who shall receive milk, cream, or ice cream which is delivered in cans, bottles, or other receptacles, shall thoroughly clean same as soon as practicable after the contents are removed and before the said receptacles are returned to shipper or person from whom the same was received or before such receptacles are delivered to any carrier to be returned to shipper. (1921, c. 169, s. 4; C.S., s. 7251(d).)