I live in an area with hard water, leading to calcium carbonate deposits all over my tiled bathroom. I want them gone, but I don't want to risk damaging the tiles.
The red arrow points at deposits that attach to the borders of the tiles. I've tried to use various cleaning chemicals and brushes to remove them but they're stuck like concrete.
In the grout (blue arrow) there are big chunks of deposits that are equally impossible to remove.
I've read a lot of tips involving acids, but I'm concerned that it would damage the glossiness of the tiles. What can I do to attack the problem?