111.25—What are the requirements under this subpart D for written procedures?
         You must establish and follow written procedures for fulfilling the requirements of this subpart D, including written procedures for:
    
    
        
        (a) 
         Calibrating instruments and controls that you use in manufacturing or testing a component or dietary supplement;
    
    
    
        
        (c) 
         Maintaining, cleaning, and sanitizing, as necessary, all equipment, utensils, and any other contact surfaces that are used to manufacture, package, label, or hold components or dietary supplements.