Hi ed, no there isn't anything in MoI that would automatically clean something like that up.

If possible you kind of want to avoid creating the stacked up lines in the first place, like have something in your GrassHopper mechanism that checks each output against previous tagged ones to see if it stacks up with any of them. But that is probably not easy to do currently in GH - that might make a good request to the GH devs for some way to detect that.

- Michael