Fill the bag halfway with vinegar. Pure, undiluted, cheap vinegar. No, you do not need fancy organic vinegar. The dollar store stuff is a natural-born killer.
Now, take the bag and drape it over the shower head. Submerge all the nozzles. Those little pimples are the calcium epicenter.
Secure the bag with your rubber band. Make sure it won’t slip. A bag of vinegar sliding onto your foot at 2 AM is a tragedy.
Let it sit for one hour. If your buildup looks like a coral reef, let it soak overnight. Go watch a movie. The vinegar is fighting your war.
The Grand Reveal
Carefully remove the bag. Do not splash the vinegar in your eyes. Trust me, it’s a day-ruiner.
Wipe the shower head with a damp cloth. Watch the flakes fall off like dandruff from a rock star. It’s gross and glorious.
Turn the water on full blast. Let it run for two minutes to flush any vinegar out. You don't want to smell a salad while showering.