What happens when you leave an Amiga 3000 sitting on the shelf for 5-6 years!
I removed the battery and popped the 'bubble'... what a mess!
After cleaning the area with dilute vinegar and hot water.
Next step is to start sanding and replace some components.
You have to be cruel to be kind...
Next, treat with diluted vinegar solution again, then when dry, apply clear nail varnish to seal.