The clear button only clears items it recognizes. It fails to completely clear ALL contents.

So, if you place a blueprint you had originally built to modify it (for example a blueprint that incorrectly had waterfill) and you hit the clear button... everything gets removed except for the water. The water remains as permanent trash.

This is not good, Clear should simply blow away everything, not just items that the lab recognizes.

At the very least and as a band-aid, what is the way through the filesystem to clear the lab back to its initial "just installed" state, preferably something not as drastic as deleting and reinstalling the mod?