BCWA S4:E56 Bill Fellows talks about the SDS and the Globally Harmonized System. BCWA S4:E57 Joseph Barone on with Dave talking collaborative cleaning in churches. BCWA S4:E58 Sean DeVore talks about the challenges of maintaining rubber tile floors. BCWA S4:E59 Dr. Greg Whiteley is a back talking biofilms, MRO’s and school openings. BCWA S4:E60 Vanesa Gandolfo with VEPPA Cleaning talks about ACE education, challenges and technology. BCWA S4:E61 Bill Fellows and Dave talk about mental, emotional and operational challenges and cleaning technicians.