I agree with John on this one.
Hard to tell on the picture, the only other thing I can think of is if it’s a porcelain tile, even though they say its 99% absorbent free that 1% still seems to be a problem.
The recommendation below is perfect, on a porcelain , if its metal that rubbed against the tile floor, like a workers tool box the soft scrub should remove it, my preference is comet or Ajax, as I can control the intensity of the abrasive by adding more or less water.
Also its perfect opportunity to sell a sealer treatment.
Verify to see that there is no wax as Giorgia mentioned by passing a blade over it. Cause then it needs stripping!
Buona Fine Settimana
(have a nice weekend)
Master Stone Consultant
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This is an interesting picture of the white tile. My first comment would be it looks like something has been spilled on the tile and stained the tile the color of the materials spilled. I would try the following:
1. Clean the tile with a alkaline based cleaner,
2. Vac up the cleaning materials
3. Clean a second time using a neutral cleaner .
Hopefully this would clean up the mess.
If that does not work then use the same process but use an acid based cleaner in place of the alkaline cleaner.
While scrubbing this area you may want to add an mild abrasive to your cleaners. You may find a product like soft scrub will take care of the problem. It’s not likely it penetrated through the glazed finish.
John E. Freitag
The Stone and Tile School
The problem that is happening with the white tiles is that they are staining and discoloring.
Does anyone know what this is or could be.I
havent seen this in person yet only seen this pic.Is there a remedy?