Well YA! That is how you do it!! :)
Use a high-quality sealant and its specifications depending upon the requirement would be the best solution for the slate tile before grout.
Wet it, then scrape with a metal spatula or spreader.
You have to make sure it is sealed with a penetrating sealer.
A wirebrush drill bit will work as a last resort. It is very tedious, very messy, and very time consuming - but it gets the job done.ANSWER:There is a product called grout release which you should be able to find at Home Depot. Slate should always be sealed before you grout to avoid this problem, but very few salespeople warn you about this.I think the wire brush drill bit may scratch the stone. Might want to try a scrub-buster first after you soak the area with grout release to soften up the grout bits. Have someone go behind you to power vac up the bits so they don't reattach to the stone. When you are done seal the stone with a professional stone sealer.
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It is not recommended to use bleach to clean slate as it can damage the surface and alter its natural appearance. Instead, use a mild detergent and warm water solution to clean slate surfaces effectively.
To clean slate, mix a bit of lemon juice, vinegar, and baking soda and make a paste. Rub the mixture on the slate and then rinse off.
To remove scratches or stains, slate may be sanded. "Honing" is generally connected with aligning the platelets of an edge, as in a knife or razor edge.
The only coping that I have seen that "flakes" is slate. If that is what you have, that is the nature of the stone. It can be sealed against stains, even sealed with a color enhancer uv protectant.
I would use a product that is designed to seal slate. You need some sort of sealing agent and anything you use will have store bought ingredients in it. You want the product to seal effectively and not wear away with cleaning. Slate isn't cheap so don't risk a beautiful stone by trying to cheap out on protecting it. Remember, you also have to seal the grout.
To remove scratches from slate, you can try using a mixture of warm water and mild detergent to clean the surface. For deeper scratches, you can lightly sand the area with 200-grit sandpaper and then apply a slate sealer to restore the finish. If the scratches are too deep, it may be necessary to hire a professional to refinish the slate.
To properly remove a broken tile without damaging the surrounding tiles the following steps should be taken: * tape off the surrounding tiles to avoid scratching or damage * CAREFULLY remove the existing grout around the broken tile using a grout scraper or similar tool * using a hammer and chisel, carefully break out the object tile starting in the center * remove the old setting material, hopefully thin-set or other cementatious material, with the hammer and chisel or other heavy scraping tool. Be very careful as you approach the surrounding tiles not to damage or scratch them. This just means more tiles to remove. * after the sub-strate has been cleaned, mix a small batch of setting material according to the instructions on the package. * if using thin-set or other mortar as your setting material, always lightly moisten the floor to prevent the floor material absorbing too much miosture from the mortar leading to premature drying and a weak bond. * using a proper size square notch trowel, apply a uniform coat of mortar to the exposed floor, then carefully apply a thin coat to the back of the new slate tile using the straight edge of the trowel [ this is called "back buttering" ] * place the new tile in position and press down to remove any air bubbles and to level the new tile to the old tiles. once the new tile is level, properly space for grout line. * allow to dry or set overnight before applying new grout[ again follow the instructions on the package of grout very carefully] * after cleaning up, enjoy a job well done!