The showerhead may not be something you think about cleaning very often. Over time, mineral deposits build up on the showerhead. Surprisingly, it may also have biofilm (or yucky slime, to be really technical) on it and blast bacteria on you every time you take a shower.
Pour vinegar in a plastic bag. Secure it to the showerhead with a rubber band. Let it sit overnight. The next morning, take the bag off and scrub the showerhead with a scrub brush.
