Remove the speaker.

The speaker's adhesive gasket is not reusable. Peel away any remaining adhesive residue with tweezers.

To help protect against water and dust intrusion, replace the adhesive gasket during reassembly. Prep the area by cleaning it with a bit of isopropyl alcohol and a lint-free cloth or coffee filter so that the gasket adheres properly. Install a new gasket onto the speaker, and then install the speaker.