Scrape scratch and rub the grout off the tiles dissolve the grout without affecting the tile replace the tile s if you can t get the hardened grout off.
Cleaning grout off slate tiles.
You may have to reapply the haze remover more than one time over certain areas as well as lightly scrape any large accumulations of dried grout.
Porous tiles especially a stone such as slate need up to two or three applications of a special grout release.
The thin set instructions say to sponge off any mortar from the tops of the tiles immediately or at least as soon as possible.
Simply attach the wire brush bit to the end of the drill clamp it down and remove the mortar gone from the surface and any nooks and crannies that can be problematic when using handheld tools.
Tile and stone sealers will work sometimes but not always.
Use the grout haze remover and brush in a small typically 3 x 3 area.
Your grout is probably discolored by a gradual buildup of dirt and grime.
Work on three or four.
Use another clean sponge to rinse the scrubbed slate tiles with.
Scrub the surface of the slate tile with a generous amount of water and a nylon scrub sponge.
Water and cheesecloth a rubber grout float diluted vinegar on porcelain or ceramic tile only and a nylon scrub pad and a commercial grout haze remover.
Pick up the dirty water with a clean grout sponge.
The cleaner alongside the brush and some good elbow grease should be able to take care of the unwanted grout on your slate tiles.
Try using a grout haze remover which is available at tile stores.
Cleaning the slate is easy but now you have to clean that grout.
If it doesn t work chances are the grout haze isn t removable.
A wire brush attachment for a hand drill cuts the time in half and gives the slate a clean surface in no time.
It s not always effective on slate however.
The methods ahead outline how to remove grout haze using.
I was doing that at the beginning but i was getting really annoyed because after placing each tile and positioning it perfectly and adding the spacers the tile would move out of place every time i sponged it off.
Don t worry you can bring back the brightness of the grout by using a 50 50 solution of water and hydrogen peroxide.
Spray the solution on the grout and let it soak for about ten minutes.
Be careful if you have a slate floor with colored grout as this bleach solution could damage the color of that grout for tougher stains mix together peroxide and baking soda into a bubbly.