Fill your baggie with 1 part CLR, 1 part water. You don’t have to be exact, just guess.
Secure it on the faucet spout with a rubber band.
Leave it for a few hours.
Here’s what the faucet looks like after soaking in the CLR solution for a few hours.
(I hope you aren’t reading this post while eating.)
Then I grab a Magic Eraser (generic is fine) and rub off the build up. You could probably get by with a rag. I just like my Magic Erasers.
And here’s how your faucet should look afterward.
As a precaution, read the CLR bottle and make sure it’s compatible with your faucet material AND spot test the CLR on your faucet before beginning to make sure it won’t take the finish off of your faucet.