https://pinside.com/pinball/forum/topic/terrybs-guide-to-repairing-alkaline-battery-damage - Inspection and Preparation. - Chemical neutralization. - Abrasive treatment. - Chemical neutralization. - Circuit board repair. - Testing. - Final cleaning and sealing. Vinegar or BiCarb soda (mixed with water into a paste) for Chemical neutralisation. [Fibreglass abrasive pen](https://www.jaycar.com.au/corrosion-buster-pen/p/NA1410) or a microblaster for abrasive treatment.