Layer newspaper on the floor across the bottom of the tiled wall.
Tile over tile in bathroom wall.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Original tiles on wall the existing tile joints are in yellow.
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.
Lay a level on the old tile and mark any high spots.
And it lasts for 20 years.
New tiles on top of old tiles the new tile joints are highlighted in red.
Very easy diy that will save you hundreds of dollars not paying a contractor.
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.
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Roughen the tile with 80 grit sandpaper.
Always stagger your joints when putting new tiles onto old tiles what to do at the edges where double thickness of tiles show.
Then rinse the wall with a water dampened.
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.