On 8/23/2019 3:40 PM, A K wrote:
I would like to repair this damage.

It is in my shower.

It looks like some kind of paint/coating was sprayed over the tile.

What can I use to repair it?

https://imgur.com/a/1MqPx3z


Did you try scraping with a single edge razor? The glaze on tile is
much like glass and depending on what it is, the stuff may come right off.

Depending on what it is, soaking with soap and water, solvent like
acetone, Goo Gone, or a good sperm remover should work.