In our bathroom we have ceramic tile about four feet up the walls. I want to take it off and paint the walls. They are old lath and plaster walls. I have been told that once the old tiles are off, the glue residue left on the walls makes it necessary to cut out the old plaster and replace it with new drywall. I have also been told that the old glue can be sc****d and sanded and that the plaster can then be lightly feathered with drywall mud.

Who should I believe?