I found that paint thinner on a Q-Tip made the built up glue soft and easier to scrape off using the small flat blade screw diver that came with my new battery and touch screen, but it wasn’t safe to use on the plastic parts, only the aluminium. So, being a mechanic, I tried using several cleaners that we use in automotives. CRC CO Contact Cleaner worked just as well at softening the old tape and glue as paint thinner, but is safe on plastics. I sprayed some into a cup and used a bunch of Q-Tips, and it worked well but the contact cleaner evaporated too quickly. I then found something that works super. It is called Perfects Contact Cleaner, and it is designed to work in the Tropics where I live. While dissolving the glue, it also protects against rust and corrosion while drying colourless and with no residue. It improves electrical conductivity, cleans, and removes aluminium corrosion. Again, I sprayed some into a cup and used Q-Tips. I still had to scrape a little to remove the goo from the notch in the plastic surround, but it was easy to remove the glue, and the residue from the battery stickum came off pretty easy by spraying the cleaner on a paper towel and leaving it on the glue for about 15 minutes. Now it looks like new.