I have laid a tile floor with an almost black tile. It is quite matte on the surface and slightly porous if you look up close. Now I have grout residue burned onto the tile that is stuck really badly. I've laid several floors before and haven't done anything different.

I've tried several "agents" but it seems that water and scrubbing work best; with the "agents" it just sticks even more. However, I have a few square meters left and I might be done by Christmas if no one has a good tip.

I am considering trying to make a claim on the floor or the grout because something must be wrong, and it's not cheap "junk" I've bought either.
 
Sometimes you have to acid wash the klinkers in 3-4 rounds. Let it work for 10 minutes each time before you wipe it off.
 
What kind of tiles are they? I have personally had issues with granitkeramik and used grout residue remover and scrubbing pads, which resolved it. Note that it cannot be used on marble or natural stone. I would have laid more now but I'm not sure anymore, maybe granitkeramik is sensitive to dirt and such?
 
Johan Gunverth said:
You sometimes have to acid-wash the tiles 3-4 times. Let it work for 10 minutes each time before you wipe it off.
Do you mean hydrochloric acid? ¨That has been suggested by others, but I'd rather not use it in the kitchen as the rest is installed and the wallpaper is up, etc..
 
No. It's called Fog Rest Remover and it worked for me. I guess it contains some hydrochloric acid. Check out www.mpdiy.com
 
gerge said:
No. It's called Fog Rest Remover and it worked for me. I assume it contains a bit of hydrochloric acid. Check at www.mpdiy.com
I actually have that exact one. Guess I'll try it again then.
 
heliac said:
Do you mean hydrochloric acid? Others have suggested it but I prefer not to use it in the kitchen since everything else is installed and the wallpaper is up, etc.
Phosphoric acid/Toilet cleaner or Tile cleaner and there's no problem using it in a finished kitchen.
...except on marble and limestone.
 
We had similar issues with that type of floor. Slightly porous, dark surface. The grout burned on because we covered too large an area at once... :-/ But after trying almost everything, we found some kind of grout cleaner with acid in it. It sizzled when poured... ::) Then we vacuumed it up with a wet vacuum cleaner and wiped with water several times. Turned out really well in the end. But be careful not to discolor the grout, it can easily happen with too much water...
 
nomis said:
...But be careful not to discolor the grout, which easily happens with too much water...
Which can also be easily removed with an acid treatment. It's lime deposits that settle on the surface when the grout gets too wet. It usually happens during floor grouting. Sometimes requires mechanical removal as a complement, with something like Scotch-Brite. Some people believe that the pigments in the grout have leached out, but that's not the case.
 
Now I can tell what worked excellently. I had grout residue left on top of the tile, very little that couldn't even be felt with a fingernail. Probably stuck down in the pores. Scotchbrite seemed to work well initially but didn't get deep down. A brass brush for stovetops, on the other hand, was perfect and didn't ruin the tile at all.

Hope this can help someone else!
 
How is it going with the fogars ?? if I use the fog residue remover, have white fogars
 
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