What is the denim bleeding onto, do you mean the jeans themselves? Indigo is very hard to remove and soaking them wont make any difference other than to shrink the jeans a bit. Is the Indigo bleeding onto the lighter parts of the embroidery or are you referring to when you cuff the jeans you get a darker indigo crease line on the inside, which is quite normal. Perhaps try a localised stain remover see if that works, but whatever you use if it can remove the stain its lightly to remove Indigo on the jeans you dont want removed!