I'm not too positive as to how Kryolan would respond to vinegar, but overall, I'm quite fond of vinegar as an overall glue/adhesive/remover. I've cleaned many a stubborn residue out of wefts doing vinegar soaks.
Might want to try a spot test to see if the vinegar is able to break down the particular ingredients of Kryolan. Is Kryolan similar to Hollister?