with great difficuty. is it a solid wall or a plaster wall? you could try a combination of a paint scraper, elbow grease and a belt sander or rotary sander. Although make sure you wear a good mask and it will create alot of dust. If you are re-tiling, glue a layer of really thin plywood on the wall first. it will make it easier if you have to do it again in the future.
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