I am finding signs of possible glue residue on the inside of the guitar case for my D-03. It isn't hurting the guitar finish yet, but it is sticky. At first I thought I was over humifiying the guitar, but my hygrometer is dialed in at 45 percent and the temp is pretty steady at 65 degrees. Next, I thought my humidifer was leaking and it is not.
The area that is showing the sticky residue is near the top edge of the side of the case, back side lower bout area.
I know that Goop product is supposed to remove glue residue. Would that work on the case lining? Until I get this figured out I'm going to put a polishing cloth in between the guitar and case.
All of my guitars are in the same closet area and this is the only one that is showing this issue.
Any ideas how to correct this?
--Fred

The problem is removing the adhesive you want removed but leaving the adhesive you want left.  It is possible to do but would require a careful approach.  You may want to take it to a professional.  For the time being, you are doing the right thing with an object between the case and your guitar.

E. Shoaf