Help- grout nightmare

[Regis Quality Tiling]

Have tried Lithofin cement residue remover. Not great. Anything stronger.? Is there an acid I can use. ? Think it begins with M.?

 

[Dumbo]

Have tried Lithofin cement residue remover. Not great. Anything stronger.? Is there an acid I can use. ? Think it begins with M.?

That is an acid . Did you leave it on to actually work , I'm not saying you did but no in point putting on then taking straight off .

 

[On one]

At what dilution did you use the Residue Remover? did you use a white pad as well?

 

[angrypirate]

I think Muriatic acid would be a tad strong, I would be concerned about it affecting the tile as well as the residue.

I found the lithofin remover a lot better than the topps one when I had grout issues.