The walls in my bathroom have been badly affected by hard water.
The tiles have not been cleaned in the last ten years (please do not ask me why). Last year, the water supply in our locality was upgraded, and now we get soft water devoid of excess iron.
Cleaning these tiles is a very big problem. I've already tried all commercial chemicals which advertise effective cleaning of tiles, but with no positive results. Youtube remedies like using vinegar and baking soda have also yielded no results.
The only option I'm left with us using concentrated acid, but I don't want to use it, because it'll destroy the colour of the tiles completely.
Any idea how I can clean the tiles without acid?