Attached Link: http://www.maleposer.com

A python script would be great especially one that could read the material names and then apply default settings to them all, but I'm not sure of all the mechanics at work here. In my experimentation, I have found (as Jaager has suggested) that complete P5 compliant MAT poses (ones that include all the parameters of the Root node or "Poser Surface" for each named material in the figure) will actually clear all the nodes not just detach them. Interestingly, this includes all linked secondary nodes even though they are not referenced specifically in the MAT pose file. This is the basis for my Clear Nodes MATS and material that you can get at Maleposer.com (in Freestuff area). These allow you to clear an entire figure at once (all materials) or just one material group at a time.