Mix baking soda and vinegar in bag over a sink. Caution: Pour vinegar into bag slowly, there is an “explosive” foaming action that kicks in.
Place bag over showerhead. Be sure it is submerged in the baking soda/vinegar solution. I had to tape the bag up so the showerhead would be totally covered.
Secure with twisty tie.
Let the showerhead soak in the solution overnight or for at least 2-3 hours. I started at 2:30 and took it off that night. It soaked for about 7 hours total.
Wipe off showerhead prior to use.
Here is the before:
Here is the After! I'm pretty happy with the way it turned out. My baking soda was old, so I think it might have worked better with new baking soda. But I will definitely try it again!