The line that everyone loves

[FattyBoomBatty]

Get brakeline style wrenches that go over the line, then slide sideways onto the "nut" part. Make sure they are the right sizes, then make sure you turn them the right way, and give 'em a good strong push at first, like an impact wrench might do.

This is of course after they've soaked a while. Multiple hits of JB80 or something like that.