On 12/01/2018 11:28, 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?

Unless someone has used the waterproof adhesive (generally people
don't), warm water often softens it very well - how much it will soften
the plasterboard is another matter, but you've got nothing to lose
trying it.

I removed large amounts of tile adhesive this way in our bathroom, but
that was on plastered brick rather than plasterboard.

SteveW