Cleaning porcelain stoneware tiles

Hello, I hope that someone can help me. We have porcelain stoneware tiles on the entire ground floor. And what can I say, cleaning is an absolute disaster, whether cleaning agents, just water, steam cleaner, special porcelain stoneware cleaner from Mellerud, or anything else, it is simply terrible. I recently thought maybe there was still a cement residue on the tiles and treated and polished them again. No difference. My son recently crawled over the tiles with a wet wipe in his hand, and even these stains do not come off. I am attaching a photo of what it looks like when wiping. I hope for help. Thank you very much

Hello questioner.
Unfortunately, the two photos are not informative enough to provide a binding answer.
Please do the following:
Set the camera on a tripod and fix the field of view on a specific area where side lighting prevails.
Photo 1 in the original state, i.e. "dirty" in the sense of your problem description, but dry.
Photo 2 (same angle) immediately after cleaning (wet condition of the surface)
Photo 3 (same angle) after complete drying.
Photo 4 (same angle) dried surface carefully treated with COLA (!, yes really), do not let anything run into the joints; let it sit for 10 minutes, absorb the COLA and rinse the surface with clear water. Take a photo after this surface has dried under the same lighting conditions as much as possible.
Then name the tile type and manufacturer and describe what bothers you about the surface appearance.
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When you have reposted these points/photos, we will take a look at whether and, if applicable, how this can be remedied.
Regards: KlaRa

Does he perhaps mean the pattern of the tiles? Of course, you can't just wipe that away so easily.

Does he perhaps mean the pattern of the tiles?

I just thought the same.

I just thought that too.

But precisely this could be clarified by providing information about the tile type + manufacturer. The consumer cannot be blamed for that (and wasn’t). I remember a case where an elderly lady complained about a new carpet in her rooms. At that time, in my presence, she spoke of faces and shapes in the carpet that frightened her. My on-site inspection led to the conclusion that it was a carpet with a melange pile. According to the principle of randomness, which sometimes also affects us when looking at the clouds and the apparently visible, familiar structures there, the surface pattern at that time (maybe here as well? Who knows!) was indeed, with some imagination, marked by what was being complained about. At that time, that was obviously no reason for a complaint. In this current case, we know almost nothing. In particular, we don’t know whether corresponding parallel mechanisms are at work. Therefore, we have to wait for feedback from the post to allow further conclusions. Nothing should generally be ruled out, but nothing should be arbitrarily assumed either! ---------------- KlaRa

Does he perhaps mean the pattern of the tiles? You obviously can’t just wipe that away.

The tiles have no pattern. They are matte and rough. I can gladly take more photos tomorrow. It’s like grease on top where the water breaks.