At one time a card or something was glued to this apron. It looks like an older type of glue due to the color of it. It is not water soluble. Goo Gone does no good. Gasoline doesn't work either. I need some ideas to get this stuff off.

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I forgot to mention that I have tried WD 40 too. No luck.

Thanks for all of the suggestions. I'll try them out and see if I can get lucky. Anybody else remember that glue we used to use in schools in the late 50s-60s that had like a tapered flat rubber applicator? There was a small slit in the flat that would release glue depending on how light or heavy you wanted it to come out. The color of this is very similar and I recall that stuff hardened like a rock to look kind of like amber. You always had to bend the rubber tip to get the old dried stuff off before using the applicator again. I wonder if this is that type of glue. If that jogs a memory perhaps you might remember the brand name.