Original tiles on wall the existing tile joints are in yellow.
Tile over tile in bathroom wall.
Roughen the tile with 80 grit sandpaper.
You can tile over tiles with the right preparation but i would never do this the proper way is to strip right back to original wall finish.
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Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Lay a level on the old tile and mark any high spots.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
New tiles on top of old tiles the new tile joints are highlighted in red.
And it lasts for 20 years.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
Generally speaking thin set adhesive also known as thin set mortar is great for setting tiles in areas subject to moisture like bathrooms while mastic adhesive is best for drier spaces like.
Grind them down with a grinder.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Tile on tile or as i say it.