When remodeling a bathroom or kitchen the hardest part can be removing the grout from pre existing tile.
How to remove old ceramic tile grout.
To avoid excess grout use a release agent on the ceramic tile.
When that day comes remove the grout and replace it to rejuvenate the installation and make the surface gleam.
Grout is made from water cement and sand which hardens over time to form a rock like material.
In some cases the only way to tear out the ceramic tile is with heavy equipment such as a jackhammer or air chisel.
Use a ball peen or masonry hammer and cold chisel to tap the pieces free.
To actually remove the grout scouring pads and water work best.
Always wear safety glasses when removing ceramic tile.