Take out the tiles and scrape off the mortar.
Removing old adhesive from wall tiles.
Apply some water to a small section of the adhesive.
How to remove adhesive from tiles fill up a container with hot water.
Once soaked take them out and scrape the adhesive off carefully.
Using solvents to remove tile adhesive first identify what kind of adhesive it is so you can buy the correct solvent.
Use a chisel to scrape away the dried thin set carefully chipping it loose from the tile without scratching it or harming the tile itself.
Apply the product to the glue.
Wipe the tiles down with a dry rag.
Use a clean cloth so you don t.
Wait several minutes and use a large scrapper to remove the mastic.
Before applying the solvent to the glue.
Then gently rub the remover on the adhesive.
The final method for removing adhesive involves using a citric acid based tile adhesive remover.
This type remover is the least toxic to humans.
Wipe any residue off.
Look for a formula that is either made for ceramic tile.
Apply an adhesive removing paste to the wall.
How to remove ceramic tile glue from a wall.
Let them soak for at least an hour or overnight.
If the adhesive is not cement based you could try sprinkling water to the wall to ease the scrapping process.
If the adhesive used was organic mastic the water will begin to soften it allowing you to.
Scrub the tile surface and the grout with a soapy sponge making sure to remove any of the thin set that is not entirely hardened.