Quote - couldnt find that thread on BA, but the way that usualy works for me is to make sure the image isnt being used, save the blend then open it again and there gone

a texture will only be saved if its not in use by clicking on the little F (fake user)

Well, I sort-of thought so too, Hedd, but those little buggers simply wouldn't disappear, no matter what I did. So, after much searching and combining methods, this is what I came up with. Hope it helps someone.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks