Cars and other vehicles, and yards, pens, chutes, or other premises or facilities, which have contained interstate shipments of animals infested with or exposed to ticks, shall be cleaned and treated within 72 hours of use and prior to further use in the required concentration with a permitted dip listed in Sec. 72.13 under supervision of a State or Federal inspector or an accredited veterinarian. [38 FR 21996, Aug. 15, 1973]