Help Needed - Tile Advice

[AjBanBan]

Hi guys,

Could you help with the following image?

We moved into a new build in November and this white patch has just appeared on the flooring in the last day or 2. Doesn’t seem to shift with scrubbing.

 

[Perfect Tiling]

They look like porcelain tiles so should be impervious to most things. You could try a grout haze remover for porcelain tiles. Its an acidic type solution that removes surface residues.....but I'm only guessing as without seeing it in the flesh its hard to be certain