This is a very common problem.
White residue on tile floor.
If it can be easily removed then you are dealing with dried products on the stone.
According to the tile council of north america tcna grout mixed with too much water or cleaned too soon or cleaned with excess water can cause the polymer to migrate to the surface.
When the excess water evaporates the white polymer is exposed.
Pour vinegar or liquid laundry detergent over the soap scum areas and let it sit for a few minutes.
When the water evaporates the salt remains on the floor and leaves white streaks.
Use a nylon pan scraper or a razor blade to carefully scrape the residue.
In addition the white line starts just where the pebble floor meets the perpendicular ceramic tile forming the door opening at the top of the floor pan.
What happens is that natural salts in the material are carried to the surface and deposited by water penetrating into the material and moving through the microscopic pores in the.
Avoid the use of vinegar on marble and granite as it can eat away at the stone finish.
Low spot theory seems wrong since the rest of the floor is fine and puddles form in other areas of the floor with no white residue.
The key is to dilute the vinegar enough to hold its cleaning power but reduce the acidity that can cause damage to some types of flooring.
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In many cases but not all these polymers are white in color.
Less common than efflorescence is the white residue that can form on polymer modified grout if the grout is subjected to excessive moisture before the polymers coalesce.
This buildup can appear as a film over several tiles or white spots scattered around the floor.
The white residue is in fact is called efflorescence or in other words the natural salts and minerals found in natural stone and brick.