Since not all will come off there will be an uneven layer of adhesive left behind.
Remove plastic tile glue from wall.
Aim the heat gun at the remaining adhesive that was below the tiles.
The adhesive that was used in a lot of these installations is very tough and you might even find that it is still not completely cured behind the tile.
Usually when you chisel the tiles off most of the thin set mortar will be removed with it.
Irrespective of the adhesive formula you have to cover the floor with old cloths as to protect it from the residues which will fall off the wall.
A good option to address the old plastic wall tile is to cover it with decorative panels.
How to remove plastic tile glue grout.
Wait several minutes and use a large scrapper to remove the mastic.
Press the tip of the scraper at a joint in the tiles.
That probably isn t the best idea.
You will then have to pry off the leftover residue.
If you want to get rid of it you might be considering removing the tile.
Just answered your thread about repairing walls after removing wallpaper but i would recommend a completely different approach for the walls in this photo.
How to remove ceramic tile glue from a wall.
Mine are plaster and the best thing that worked was to soak the glue on the wall with hot soapy water.
This can be accomplished using a pry bar to peel off the larger chunks.
If the adhesive used was organic mastic the water will begin to soften it allowing you to.
Look for a formula that is either made for ceramic tile.
Apply some water to a small section of the adhesive.
If the adhesive is not cement based you could try sprinkling water to the wall to ease the scrapping process.
Apply an adhesive removing paste to the wall.
You can try sanding with 100 grit sandpaper or you can use klean strip adhesive remover but neither of these methods is guaranteed to easily produce satisfactory results.
Scrape the surface of the adhesive with a stiff bristle brush.
If any adhesive gets stuck to the brush remove it by hand and continue until no more adhesive remains on the wall.
Step 3 wipe some tile adhesive remover over the surface of the wall.