Color catchers catch dye bleeds whether they come from fabric or embroidery thread. In my opinion, though, they are not as effective as Synthrapol. Whichever one you use, it's really important to use ***lots*** of water and to make sure that whatever is likely to bleed does not stay in contact with other fabrics while damp.
I don't think Retro Clean necessarily takes out the blue marks, although it might help.