tiling on old adhesive..

[dazzle]

Hi, I've got a bathroom wall to tile where the old tiles have recently been removed, the thing is the wall still has a covering of the old adhesive, does this all need to come off? I've scraped it all down level but do I need to get every bit of it off?

 

[DHTiling]

As long as its flat enough to tile onto then prime and away you go...........dave..

 

[Fekin]

Aye, slap it on and away ye go