Your grout is probably discolored by a gradual buildup of dirt and grime.
Cleaning grout off slate tiles.
Use another clean sponge to rinse the scrubbed slate tiles with.
Try using a grout haze remover which is available at tile stores.
The cleaner alongside the brush and some good elbow grease should be able to take care of the unwanted grout on your slate tiles.
A wire brush attachment for a hand drill cuts the time in half and gives the slate a clean surface in no time.
Use the grout haze remover and brush in a small typically 3 x 3 area.
Spray the solution on the grout and let it soak for about ten minutes.
Safety tips tricks.
Tile and stone sealers will work sometimes but not always.
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.
There are essentially only three things that can be done to remove the hardened grout from your wall or floor tiles.
Work on three or four.
Cleaning the slate is easy but now you have to clean that grout.
It s not always effective on slate however.
The methods ahead outline how to remove grout haze using.
Porous tiles especially a stone such as slate need up to two or three applications of a special grout release.
Don t worry you can bring back the brightness of the grout by using a 50 50 solution of water and hydrogen peroxide.
How to remove grout haze from a slate floor 1.
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.
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.
Scrub the surface of the slate tile with a generous amount of water and a nylon scrub sponge.
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.
Pick up the dirty water with a clean grout sponge.
If it doesn t work chances are the grout haze isn t removable.