I’m not trying to pull a Hyperbole and a Half here, but I got myself a container of Bar Keeper’s Friend, and I’ve been scrubbing the shit out of everything in my house. My sister told me about BKF years ago, and for some reason I ignored her instructions. Honestly, I’m so sorry I waited. The difference it made to my bathtub alone is night and day:

BEFORE: Disgusting. This is what it looked like when we moved in, so I assumed it would be that way forever.

AFTER: Totally worth my sore arm. Totally.
Do yourself a massive solid and go buy some Bar Keeper’s Friend right this second. It’s less than two bucks, and I’ve cleaned half my house with it already (okay, that may be a bit of hyperbole, but not much) and still have half a can left. Now I’m going to see what it can do for my kitchen floor.