This is with 6.2 of course.
I have really a sad amount of now-useless prefabricated PDC components stuck on Earth. What can I do with these? I can't scrap them like I might with Ship Components, Missiles, or Fighters. I can't even donate them to science. The only thing I can come up with is to keep them in the stockpile for eternity(not optimal since I may well have this situation come up again and it's just a little annoying) or to dump them on some useless rock(Apophis, Bacchus, Icarus come to mind). I would like a better solution if there is one, I don't think the environmentalists will be singing my praises if I do that.