Your IPA is temporarily liquifying the oil and grime, but as it evaporates near room temperature pretty quickly (as do other degreasers like mineral spirits, paint thinner, lacquer thinner, naphtha, etc.), it disappears and leaves the oil and grime behind.
While you're flushing it out, be sure to move the typebars back and forth to help flush the grime out of the segment as you add more IPA (or other degreaser). If you have it available, it's also helpful to loosen things up with a degreaser and follow it up immediately with compressed air to blow out all the grime.
It may take several rounds of flushing and air to completely free up your typebars. Things aren't really clean until they're dry and move freely.
reply to u/Otherwise_Thing_6384 at https://reddit.com/r/typewriters/comments/1ruh4u0/faceit_freede_problem/