Unfortunately, it didn't do any job. I don't know if I did something wrong (since there are no clear instructions on how to use it and the dilution ratio, etc.), but I didn't see any change.

The purpose for which it was purchased was to remove stains, drops, and marks from tiles (wood texture and cement) from the painting that was done on the walls (mostly white plastic color).

So, Kerakoll did absolutely nothing, even when it was undiluted and left on the tiles for a considerable amount of time before being rinsed off. On the contrary, a simple floor cleaner, a little chlorine, and a dish sponge did the job. With the necessary effort, of course. It's a shame... I had high expectations because it was recommended to me as a miracle worker.