My celaka contraktor washed my house with acid, but did not sweep it dry. I duno how long after that onli i visited my house & see pools of water on the floor. Faster2 rinse with pails of water. Too late.. the area submerged in water -> grout lines offcolour & the tile edges look like smudged, & dulled & these are niro tiles !

Ok, thanks everyone for input and suggestions. I will talk to tilers. At least now I know my options. If not contractors sure say this cannot that cannot everything cannot.

Not the ss. He specific told me is the tiles, he say sone tile change color or shine, but he not sure what type of tiles so he just warn me.

Tumpang thread. My kitchen wall tiles are white, so we used white grout. Now, we looked and a lot of the grout lines have turned yellow or dirty as work was still done after they've applied the white grout. What can be done about this? Re-grout?

White paint. Sounds tedious. haha. OK. Will try that if all else fails.