I have some corrosion on a brushed nickel kitchen faucet. It's mostly where it rotates and where the filter connects, but it's a bit all over. I don't knowingly use corrosive cleaners on it or hang the wash cloth on it. My only guess is galvanic corrosion, but I'm surprised to see it on a mass-produced faucet.
Has anyone seen this before? What causes it? How can I prevent it?