Don’t buy any of those toilet tank tablets. They often will corrode and wear down the tank valve over time, and your toilet will start to run on its own (or could even break).
White vinegar is good on any wood or porous surface because it’s small enough to get inside and kill the biological things (black mold, etc) while bleach just tends to just clean the surface and evaporate quickly.
Unfortunately it’s not going to stop ill-informed Americans from sneering “yeah, how’s that communism going for CHEEYIANAH” if you mention Medicare for all