Any tricks to removing a stuck/stubborn/rusted-in place bleeder?

Have had luck bleeding at the fitting where the line goes into the caliper/wheel cylinder as it gets any air out of the incoming line. Presents fresh fluid up to this point to head into the caliper.

PB Blaster soak for 24 hours if you have time. Use the special 6 sided brake line wrench so you don't round off the line nut.

Back and forth a little at a time. Carefully heating the nut with oxy acetylene torch, then more PB Blaster helps loosen them up too. (If it is a rubber flex line coming in, don't use heat)

50 year old cars, got to bend the rules once in a while to avoid a can of worms.