However it is possible to damage the tile if you press too hard or for too long.
How to remove old tile from wall with hard grout.
Take this sweet solution and pour it onto excess grout on a floor.
Take one gallon of warm water and dissolve a cup of sugar into it.
If you have wall tile with too much grout then soak paper towels in the solution and place them on the tile.
In a bucket mix a gallon of hot water with a cup of granulated sugar mixing the two until the sugar dissolves in the water.
Then using some fine wire wool rub gently over the grout which will begin to dissolve and rub off at the same time.
Take the water and sugar mixture and pour it over the grout that needs removed.
Use the scraper to clean off large debris and then clean off any soapy residue with a damp cloth.
An oscillating tool removes grout without harming the tile because the grout is much softer than the tile.
Once the tile is clean and has no more hardened grout wipe over with a damp cloth and leave to dry.
Keep the tile wet with the sugar water for at least two hours.
The basic method for hardened grout removal use warm water and wipe it over the surface of the tiles with a sponge.
Begin by giving the tile a good cleaning with a sponge and soapy citric acid water as a descaling solution and use a toothbrush to deep clean grout to remove deposits and stains that may make removal more challenging.