How to clean black porcelain tiles?

[SaviS]

I have black Porcelain tiles glossy 

My question is no matter how I clean it looks dirty,I have tried the the possible solution from Google

Please advise or any suggestions

Thanks 

[EricL]

Hello @SaviS, 

Sorry to hear that you still have that residue on your tiled floor. I did propose to @chubb to wash the floor with very hot water and detergent to possibly remove the oil and grease film that's deposited itself on top of the tile. This particular phenomenon often happens when the cleaning cloth you're using has a bit of oil or food particle left in it. When repeatedly used it spreads the food oil around the tile and leaves a very fine film.

In order to melt this thin layer of oil and grease, the floor must be washed in hot water and detergent. The cleaning rags must be washed in very hot water and detergent to remove all oil and food contamination. 

Please keep us updated with your progress, we look forward to seeing your floor clean and polished.

Eric