Armature: Clear Vertex Weights of selected Mesh I used set Automatic Weights when Parenting the Mesh to the Armature. However the Oxygen tanks are assigned to all kinds of bones. How do I remove all bone weighting from the selected Mesh?

I could go into WeightPaint and select every single bone and make sure the Oxygen tank is nowhere selected. But that would be a terrible inconvenience. And setting Vertex Weights in the right Panel of the 3d-View only sets the weights for a single Vertex.
Select the vertices, if there is no active vertex, deselect one, and select it again with Shift RMB.
Enter the desired weights for the vertex, then press copy, to copy the settings to all selected vertices.





Although the other vertices copied the weights, there still may be additional zero weighted groups. To remove them, use Clean button on all groups.