Finish sanding the entire wall with 120 grit sand paper on drywall sanding pad.
How to remove one wall tile.
Use a ball peen or masonry hammer and cold chisel to tap the pieces free.
Tiles installed with thinset or another tile adhesive often require more work to remove them.
Be careful to cut away only the grout and not into the wall.
Last but not least you should remove the tile adhesive from the wall and from the back of the ceramic tiles.
In some cases the only way to tear out the ceramic tile is with heavy equipment such as a jackhammer or air chisel.
For semi soft adhesive mastic use 120 grit sandpaper to remove it from the wall.
In order to remove the adhesive from the back of the wall tiles you should use a scraper.
Move the nail set.
Allow to fully dry.
The method used to attach the tiles to the wall affects the way the tiles come off.
To remove wall tiles start by heating up the grout between the tiles with a blow dryer so it s easier to remove.
An electric chisel is another option.
Cut away the grout surrounding the tile or tiles that you want to remove.
Next use a chisel and hammer to pry the tiles off of the wall.
You should be able to slide a putty or plaster knife underneath the tile.
Periodically scrape adhesive off the exposed floor with a putty knife or a floor scraper.
Remove the tiles with a flat pry bar placing the edge low against the side of the tile and striking the base of the knife with a hammer.
Always wear safety glasses when removing ceramic tile.
Once the tile is down take a 5 in 1 tool and scrapper to remove any excess grout.
Then use a utility knife or rotary grinder to scrape away the grout until the spacer lugs between the tiles are visible.
Fill drywall gouges with drywall joint compound and sand it smooth.
To remove thinset use a stiff putty knife and some elbow grease to scrape it from the wall.
Therefore you should use the same chisel to remove the adhesive from the wall by tapping it with a hammer progressively.
Work slowly and at about a 45 degree angle.
When you believe you have removed or cut away most of the grout stop and examine your work.