I got rid of the generator, the structures it made and the necronoids it had, but i just cannot find a way to remove the floor it made upon corrupting it's vicinity. Doesn't let me remove it; can't blast it away; can get burned and then marked for removal, but doing so only restores it to it's non-burned version. Destroying the other structures doesn't help either. Tried deconstruction and both snow/pollution removal, but it remains unflagged.

I can build on top of it, which helps with structures, but having it there essentially removes any dirt there was forever. That can be REALLY BAD if it lands on my crops :(

Hence, the question on the title. Any help?