Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Tile over plaster walls.
Also now it s been plastered you will be restricting yourself to a tile with a max weight of about 16 kg m2.
Layer newspaper on the floor across the bottom of the tiled wall.
Cover with cement board tape off.
Follow manufacturer instructions to a tee.
Testing the wall for durability.
That is true you cannot tile over plaster if that s your plan.
If you re not sure if you have lead paint test kits are available.
You would have to remove the plaster and replace it not with drywall run from a contractor who says that.
I have repaired tile jobs that were over 20 years old that the tile was applied directly to regular sheetrock and plaster walls.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
Bring plumbing to code.
It used to be very common to put tile up on whatever the wall was and seal the the tile.
Both painted and bare plaster allows for the installation of tile.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
Adhesive grout and tile 20kg max weight onto plaster.
Can you lay tile on plaster walls.
Or flatten walls with a latex modified skim coat product.
Add a diverter and shower line in the wall.
This was back in the 80 s.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Don t use paint glue pva wall paper paste only use the primer recommended by the adhesive manufacturer of your chosen tile adhesive.
But with cement board.
Not all plaster wall surfaces will support the tile properly.
Then rinse the wall with a water dampened.
If plaster is any way compromised you should tear out to studs and start over.