At any reasonable time, a representative of the Secretary may enter and inspect any establishment in which the Secretary reasonably believes a dangerous household substance is being manufactured, repacked, or relabeled. On entering any establishment to make an inspection under this section, the representative of the Secretary shall present appropriate credentials to the owner, operator, or agent in charge. During any inspection under this section, the representative of the Secretary may obtain a sample of any product, package, or labeling in any reasonable manner.