Cleaned the Tiles - Grouts gone Funny!? Advice

[mz30]

Looks a bit like the adhesive has not been cleaned outta the joint prior to grouting to me,Anymore pics?

 

[jparker86]

Im not at the house now to take some pictures but as soon as I get home ill get some more up.
What is the best thing to use to clean these porcalin tiles? sodium hydroxide i read mixed reviews but appears to have done a good job in bringing the file back to life?

 

[Mr T]

Mate those tiles look ok to me I would just stick to what your using and make sure the grout joint get an even scrub and you should be ok

 

[AliGage]

Fila do an excellent grout cleaner available at Topps. Give the grout joints a good clean. The dark markings do look a bit like adhesive poking through. There's no telling what your grout colour is yet. But if the cleaner brings it up, apply a protector and then set to work on removing 2 years of dried grim from the surface of the tile. Of course give it a mop a few times before you clean the grout. Just warm water. Leave the stubborn cleaning until after you've protected the grouting.

 

[jparker86]

Fila do an excellent grout cleaner available at Topps. Give the grout joints a good clean. The dark markings do look a bit like adhesive poking through. There's no telling what your grout colour is yet. But if the cleaner brings it up, apply a protector and then set to work on removing 2 years of dried grim from the surface of the tile. Of course give it a mop a few times before you clean the grout. Just warm water. Leave the stubborn cleaning until after you've protected the grouting.

is sodium hydroxide ok for cleaning tiles