Biofilm is a defensive effort in which colonies of similar bacteria protect themselves against chemical assault. The germs cooperate to build and maintain a barrier that keeps even strong disinfectants such as bleach and iodine at bay.
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Bacterial biofilm can be found in many damp or moist places. A rock in a river or brook that has become slippery is covered with biofilm. The plaque in your mouth is another example. Biofilm is also found in and around sink drains, and in that slimy stuff that’s so difficult to get out of the inside of a vase that’s been in use for several days.
Biofilms can be present even when the surface doesn't feel or look slimy, however. Biofilms may be removed by physical agitation such as brushing or scrubbing.
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