Any residual adhesive or debris will prevent your screen from sealing properly.

Use the flat end of your spudger to scrape off as much adhesive as you can.

Use tweezers or your fingers to peel and remove any remaining adhesive.

Take care not to puncture the battery with your tweezers—a punctured battery may leak dangerous chemicals or cause a fire.

Clean the perimeter of the frame with a small amount of highly-concentrated isopropyl alcohol (over 90%) and a lint-free or microfiber cloth.