Bathroom sealants are used to protect tiles from moisture. If you want to remove the sealant, perhaps in favour of upgrading to a different product, you need to use a solvent made specifically for your sealant.
Prepare the floor by sweeping it and mopping it. Allow it to dry completely.
Lay the white cotton sheets over the area of the flooring where you would like to remove the sealant. White sheets are necessary so that the solvent does not transfer the dye from the sheets onto the tile.
Apply the solvent to the sheets until they are saturated.
Allow the solvent to dry completely, then pull the sheets from the bathroom flooring. The solvent will have transferred the sealant from the floor to the sheets.
Repeat the process if necessary to remove all of the sealant.
Consult your local hardware store to ensure that you purchase the proper solvent for your sealant. Open doors and windows to provide adequate ventilation.
Make sure that the sheets are flat against the floor when you apply the solvent; otherwise, the solvent will not transfer correctly.