If you want to tile the surface use a level to check if the walls are plumb otherwise you should redo the process of removing the tile adhesive until you reach the desired result.
Removing tile that is directly adhered to the wall.
Allow to fully dry.
Repair any loose or cracked tiles.
Use a wallpaper steamer and scraper to remove the remnants of old tile adhesive from the wall the steam softens the adhesive making it much quicker and easier to scrape off without any hammering note that this steaming method may cause blown render to fall from the wall so a good alternative is to soak the walls with warm water prior.
For semi soft adhesive mastic use 120 grit sandpaper to remove it from the wall.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Vinyl tile adhesive is a pliable type of tile adhesive that gets stronger the longer it s applied.
An ordinary grout saw typically does not work for wall tiles because of lug spacers that connect adjacent tiles underneath.
The rock hard adhesive will be thinset a cement based product.
So the longer amount of time this adhesive has to set the harder it is to come off.
Apply an adhesive removing paste to the wall.
Look for a formula that is either made for ceramic tile adhesive or that has a citric acid or soy base.
Scrape the grout away with a utility knife.
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Usually you can get a few bits of the adhesive off from scraping the tiles.
Fill drywall gouges with drywall joint compound and sand it smooth.
To do so make sure all of the tiles are intact and secure.
To remove thinset use a stiff putty knife and some elbow grease to scrape it from the wall.
This method takes a while but comes with a low risk of damaging the surrounding tiles.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
Removing vinyl tile adhesive.
Removing tiles mounted on plasterboard may be either a simple or challenging task depending on the tile adhesive that was used and how it was applied.