How do you get rid of a glue smell in a mattress?

You might try a normal dryer sheet.

ALL THE GLUES I USE (WOOD, 2-PART EPOXIES, WHITE, INSTANT, AND GORILLA GLUES, THE ODOR FROM THESE GLUES DISSIPATE THRU THE CURING PROCESS. IF ITS THE ODOR FROM THE GLUE WHEN YOUR GLUING THINGS TOGETHER, MOVE CLOSER TO A WINDOW AND PUT A FAN IN THE WINDOW TO EXHAUST THE ODOR.