How do I clean off calcium buildup in my bathroom sink?

CLR

I have the same problem here in Texas and that’s why I usually once a month take some sturdy rubber bands (hair tie might work too) and a cheap ziplock bag from the dollar tree store and I put straight white vinegar into the ziplock bag. I then take the rubber band and wrap it around the faucet/shower head and then take the ziplock bag around the spouts where all the mineral deposits are and fasten it with the rubber band making sure all of the spout is immersed in the vinegar. I leave this on overnight and next morning remove it and use a standard needle to open any remaining holes that might be covered. Usually just comes out as soon as you run some water. Even if not all loosens the first time if it’s really bad, if you do it once a month like I do, it eventually all loosens up. CRL will do this as well, but I have a septic tank and don’t want to kill the natural bacteria in it. Good luck!

you can try cleaning vinegar, clr or just hit it up with limaway. the trick is to not let the cleaner dry out. I will soak a paper towel or 2 wrap it around the gunky spot and cover with a a plast wrap.

I use Lime Away... you may have to soak a cloth in it and leave cloth on the spots for a while.

A scrubby and Clorox cleanup will do it