Brett creates s film which makes it more difficult to clean and sanitize away than brewers yeast. I would probably stick to something solid vs plastic unless you want to dedicate it.
This is a good read for anyone using Brett: http://wineserver.ucdavis.edu/pdf/attachment/118%20sanitation%20agents%20to%20fight%20biofilms.pdf
Maybe I am misreading that but I read it as though they were looking at chemicals used for both cleaning and sanitizing in the same shot, which would be different from using a detergent first (like PBW or Oxy) and a sanitizer second. Nothing wins like caustic but I doubt many homebrewers have a tank of caustic.