black grout stain on polished porcelain

[Bill]

View attachment 86281

Can you point out what the staining is... or take a photo of an unfixed tile for comparison, please?

I can't make out the staining, in the last photo.

 

[Oscarflash]

The black spots

 

[McLovin]

You must have been desperate to go searching in Asda you would have thought the pro chemicals would have sorted it first.

Desperate is not the word. The retailer the customer and I had chosen the tiles from sent a team down the next morning trying to sort it with everything they had. In fairness to them the Flash sponges were their idea. I wound never have thought of it.
Credit where credit is due.

 

[Oscarflash]

Mclovin when you said about those magic sponges I thought no way that won't work........well **** ME IT DID
what a great doge Thank you. The only thing now I'm going to need about 150 of these. It'll properly take me a day or so but the job will be right thank you once again

 

[McLovin]

Mclovin when you said about those magic sponges I thought no way that won't work........well **** ME IT DID
what a great doge Thank you. The only thing now I'm going to need about 150 of these. It'll properly take me a day or so but the job will be right thank you once again

No probs pal. I never thought they would work when they were suggested to me. I don't know whats in those sponges but god are they good.

Glad I could help you out. Good luck with getting it all sorted but at least there is an end to it now.