On Friday, 12 January 2018 11:28:35 UTC, GB wrote:
Got rid of the old tiles in the kitchen.

Some of them were on plasterboard, and I have some holes to mend, but I
can cope with that. The problem is that some of the old tile adhesive is
still adhering to the PB. What's the best way of getting a clean
surface, ready for retiling, without destroying the PB?

Impossible. Replace the PB, adding insulation if it's an outside wall.
PB can be disposed of in garden soil if wanted.


NT