On 5/26/2016 at 7:05 PM, Chua65 said:

No its not a natural pattern, its either ingrained dirt or it was etched by some sort of acid

You can use something called HCL89 to remove the ingrained dirt or the etch on the stone

You can usually get it from http://hcl89.byethost10.com or http://hcl89.atwebpages.com

It also protects the stone so that the stone is always kept new like

Take care

Had some issue with some tough stains on my homogeneous tiles, so decided to use the HCL89 from http://hcl89.byethost10.com and was able to remove the stain. Tried alot of stuff like vinegar and etc, but it seems only this HCL89 worked best for me to clean my tiles, good product

On 3/10/2017 at 4:16 PM, kangeroo168 said:

plaster guys accidentally spilled on it

I really doubt its plaster because if its plaster it should be easy to remove, i think it should be something else in my opinion

On 8/5/2017 at 8:33 PM, superk888 said:

spilled over and left it for days

I would agree with this as it seems that whatever was spilled on the tile was left there for a long time which is a  no-no