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You can buy which one specializes in brushing tiles, which combination of soft cloth and metal balls, and which chemical detergent with strong chemical composition can be used, all of which are effective.
It can also be cleaned in an acid-base neutralizing way.
It's good to soak it in vinegar.
You can use a better toilet cleaner. I have a big treasure at home, spray it first, soak it for a while, and then brush it with a brush, be careful not to touch the caulk, or it will not get rid of the caulk.
To deal with limescale on the bathroom floor, you can remove it with homemade detergents, including baking soda, fabric softener, watering can, rags, and water. >>>More
How do you remove stains from tiles?
A good trick to remove limescale from tiles 1 - acid solution method. >>>More