Goo gone is what I used. I initially soaked in PBW to get the paper portion off and then used some mineral spirits, which did dissolve the glue. The down side was that it had this chemical smell so I switched over the goo gone. This did the trick but goo gone ain't that cheap.
One other thing, about this process. Before I did the White Lab tubes, I put my beakers and Pyrex flask in the pressure cooker. I did fill the beakers and flask about half way with water. I got this heavy white residue up to that level. Has anyone else experienced that.
I'm wondering if it is a result the minerals in the water. We have Cleveland municipal water with low Calcium and Magnesium content so I can't understand what it is. Any comments would be appreciated.
BTW, thanks for the previous helpful comments.