Try using a grout haze remover which is available at tile stores.
How to grout natural stone wall tiles.
When using paint scrapers or razors apply a horizontal motion in a single direction to hit the base of the grout residue.
Load the margin trowel with grout and.
It take much longer than normal grouting but produces a better finish where there are more spaces between the tiles.
Wipe the grout stain area with a damp sponge to remove the excess grout and the stain.
Apply the grout using a grouting float.
To start clean out all the grout lines by vacuuming and scraping out any thinset projecting above the tile.
This is very similar to a pastry bag where you squeeze and direct the grout into the areas between the tiles.
Pour some grout mix into a mixing bucket and add water according to the manufacturer s instructions.
The first is a grout bag.
If your backsplash tiles have a lot of grease on them reach for the mildly abrasive baking soda in your cupboard.
Rub the mixture over the greasy spots and wait at least 10 minutes.
Begin by scooping up a load of grout onto the grout float using one end of the float.
How to grout natural stone tile 1.
Mix the baking soda with some water to form a paste that s thick enough to stick to the tiles.
Follow the manufacturer s directions.
There are 2 ways to apply the grout to natural stone tiles.
Move the float in a circular motion making sure that grout completely fills gaps between tiles.
Also pick up a bottle of grout release at a tile store.
You can also try to scrape grout away with the blade of an old fashioned wet shave razor.
Only grout as much tile as you can clean off on a few minutes.
Scrub away the grout.
Do not cover the entire float with grout.
Let the solution sit for at least five minutes.
The three photos show how to apply the grout.
Don t let the grout dry on the surface of the tile or cleanup will be much more difficult and the tile can actually be damaged.
Sweep diagonally across the tile forcing the grout into the joints.
Spray the solution onto the grout stain.
Plastic palette knives and rubber paint scrapers can be safely used on stone tiles.
Next apply the grout to the tile working from the bottom of the section upwards and holding the float at an angle of about 45 degrees.
Find one with the masonry tools at the home center.
Then wipe the surface with a damp rag until it s free of dust.
Porous tiles especially a stone such as slate need up to two or three applications of a special grout release.
It s not always effective on slate however.