I found the following link that I hope will help:
http://www.parish-supply.com/mastic_removal.htm
To remove a shower arm, you will need to use a pipe wrench or adjustable wrench to unscrew it counterclockwise from the water supply pipe in the wall. Be sure to turn off the water supply before attempting to remove the shower arm.
The wall where the plumbing enters into the shower. Also known as a wet wall because it has water pipes in it. It is recommended that the head wall have access on the wall opposite the bathroom to be able for plumbers to remove or replace control valves, drains etc.
You can in areas like a kitchen back splash. Just use a mastic glue. Don't tile over drywall in areas prone to high moisture, such as a shower, tub or floors.
There are many different types and brands of mastic, so these are generalizations of it. Mastic is a form of tile setting material. Unlike thinset, it has a tacky quality and is meant to be used on wall tile not being put in a highmoisture area like a steam room or shower floor. Mastic should never be used with natural stone, tile larger then 8"x8" unless white clay 8"x10" or some variation of it. If you read the directions on the mastic it may say it can be used on the floor with tile up to 12 x 12. The issue is that those tile must be smooth backed. Almost no commercially sold tile is smoothed backed. There for, mastic can almost never be used on the floor. The advantage of mastic is its tacky texture. This allows the wall tile to not slide on the wall while you are installing. It is also a smooth consistency and makes it easier to spread for a novice. It is also commonly used in craft projects where tile is being put to table tops or a vase.
To remove a soap dispenser from a shower wall, first check for any screws or mounting hardware holding it in place. If there are screws, use a screwdriver to remove them. If it is glued on, gently pry it off using a putty knife or a flat tool to avoid damaging the wall surface.
To remove a soap dispenser from a shower wall, first check if there are any screws holding it in place. If so, use a screwdriver to loosen and remove them. Then gently pull or twist the dispenser to detach it from the wall, being careful not to damage the surface. If it is adhesive mounted, use a utility knife to carefully cut through the adhesive and slowly peel the dispenser off.
The recommended method for installing a backsplash using backsplash mastic is to first prepare the surface by cleaning it thoroughly. Then, apply the mastic to the wall using a trowel, making sure to spread it evenly. Next, press the backsplash tiles into the mastic, starting from the center and working your way outwards. Allow the mastic to dry completely before grouting the tiles.
To remove shower fixtures, first turn off the water supply. Use a wrench to loosen and remove the screws holding the fixtures in place. Gently pull the fixtures away from the wall to detach them. Clean the area before installing new fixtures.
To remove a Moen shower valve, you will need to turn off the water supply, remove the handle and trim plate, unscrew the valve cartridge, and then pull out the valve body from the wall. Be sure to follow the manufacturer's instructions and use the appropriate tools for the job.
You can use 3m's caulk remover and a sharp razor blade.
To effectively remove adhesive from a shower wall, you can try using a mixture of warm water and dish soap to soften the adhesive. Gently scrub the area with a sponge or cloth, and then rinse with clean water. If the adhesive is stubborn, you can also use a commercial adhesive remover following the manufacturer's instructions.
To install adhesive shower wall panels effectively, follow these steps: Clean the wall surface thoroughly to remove any dirt or debris. Measure and cut the panels to fit the wall space accurately. Apply adhesive to the back of the panels and press them firmly onto the wall. Use a level to ensure the panels are straight and properly aligned. Allow the adhesive to dry completely before using the shower.