I have 433 "delete component" nodes and they are slowing down Maya alot (it takes several minutes to do anything)

So I open the attribute editor, select one of the hundreds of "delete component" nodes, and then i click on the "attributes" drop down window and select "delete attribute". A "delete attribute" window pops-up but nothing happens, the node is still there.

Can someone explain to me how it's done?

thx for any help.