Uhhhh crap I probably misunderstood. Are you going to brillo the fitting or the aluminum(?) line. Yeah, I would degrease and Brillo the cone part of the fitting in the block it may have some crud built up. I would not Brillo the line. Wipe it out good then wet it with a little motor oil to lube the O-ring and wet the end of the line too.
Rule of thumb is usually lube a seal or Oring with the thing its sealing ie motor oil here would be good.