The department of health and human services, or its duly authorized employee, whenever it is deemed necessary to safeguard the public health, may post upon any building or part thereof containing such materials or articles, or from which the same have been removed, a notice or warning of the danger of contagion or infection resulting from violation of the provisions hereof, and may continue such notice upon the said premises until the same have been properly cleaned and disinfected. Whoever removes or effaces such notice or warning except by order of the department shall be guilty of a violation.