Here`s what Debbie wrote me regarding a similar problem:

spray a comb with the lace releaser and comb the glue out of the hair, once
all the glue is out you can wash it with shampoo. you are correct, the
shampoo will not get the glue out of the hair, you must first remove it with
the lace releaser (and yes you can use pure also) and then shampoo it well
afterwards.

Deb