Grayed out decals

How do you clean up or restore decals when they are grayed out and cannot be deleted ?

My guess is that you have a renderer set as current that doesn’t support decals.

It’s the Rhino render.
(If another renderer is active and it doesn’t support decals the green decals icon/button disappears completely)

ok, never mind. I see what’s going on.
It was a grouped polysurface. Sometimes it’s a pain to texture something and end up extracting a surf here and there to just decal it and then group the whole thing together (instead of joining the surfaces).