Is there a way to remove all weight paint on an object/armature? I set automatic weight paint from an armature to an object, but I wanna undo it but it won't let me ctrl+z that far back? So... can I get rid of ALL weight paint without using the subtract brush ? Like just clear absolutely every paint. My character's hair mesh intersects with the arm mesh just a bit, so the paint for the arm bone got on the hair mesh, and it's moving the hair wherever the arm is, and it looks bad, lol.

Thanks for your time.
I had the same problem, only way I was able to re-rig with all the old armature removed and start from scratch was to delete the bones that get created on the object itself, one at a time: