Usually you can get a few bits of the adhesive off from scraping the tiles.
Scrape tile adhesive off wall.
Use the straight edge or razor blade to gently scrape the glue off.
How to easily remove old tile adhesive and grout from walls using a heavy duty scraper uploaded by upload to youtube for windows phone.
Once the mortar softens up scrape it off with a 4 scraper or a wallpaper stripper.
Repeat the process until all tile adhesive is removed.
Do not gouge the walls.
Step 3 wipe some tile adhesive remover over the surface of the wall.
If you damage the wall significantly you have to repair it before installing the new tile.
By working with patience and with great care you will remove the largest amount of the wall tile adhesive.
If the adhesive has dried you will need to either scrape it off use the apropriate thinner or sometimes it will simply peel off.
But other parts of vinyl tile adhesive may take more time to come off completely.
The critical aspect is to scrape the adhesive off the wall surface as much as possible by using a wide chisel and a hammer.
It depends on the adhesive some are also water based and clean off with warm water.
Adding water will damage the wallpaper.
If the glue is thick you may need to reapply.
Although you should aim the heat gun toward the adhesive you shouldn t press it directly onto it.
When the adhesive is softened through and can be easily cut through with a putty knife it is ready to come off.
The first step is to use a putty knife to scrape off the adhesive while applying heat to the adhesive to soften it up.
Scrape down the walls with a putty knife removing the softened adhesive.
If only traces of the glue remain scrub very gently with a dry scotch scrubbing pad.
This may take a while depending on the size of the wall and the amount of adhesive you need to get rid of.
Scrape off the adhesive.
If so repeat steps 3 5 as necessary.