The main issue: the toilet tank isn’t where cleaning matters most

Use baking soda in the bowl, not the tank
Pair it with vinegar occasionally for fizzing action
Clean the tank separately every few months (with diluted vinegar if needed)
🧠 Bottom line

It’s not harmful in small amounts, but adding baking soda to the tank is more of a “feel-good hack” than a high-impact cleaning method. You’ll get better results using it directly where the grime actually is.

If you want, I can give you a super simple routine that keeps your toilet clean with minimal effort.