Specifications include, but are not limited to: A. The used reflective sign face shall be removed and the aluminum sign blank cleaned prior to return to the City of Phoenix. B. The cleaning process shall be performed by a high-pressure water blasting process. C. The cleaned surface shall be free of reflective/non-reflective sheeting, application adhesives, or any other debris or contaminants, and both surfaces thoroughly dried prior to bin storage and delivery to the City of Phoenix Signing and Striping Shop located at 4035 W. Glenrosa Ave. D. The second surface of the cleaned aluminum sign blank shall also be cleaned and free of reflective/non-reflective sheeting, application adhesives, any form of graffiti, tape, stickers, or any other debris or contaminants as well.