Since plastic shower heads appear to "load up" with more bacteria-rich biofilms, metal shower heads may be a good alternative, said Professor Pace.

Dual-purpose shower head consists of handle and head and features that the water distributing plate is either one made of rough porous stone or conventional one with one cover of porous coarse cloth.

Clean a shower head with lemon: To clean a shower head, fill a sandwich bag with distilled white vinegar and three to four drops of lemon essential oil.