HappyPills

So I recently dug some of my old nerf guns out of the basement and among them was a vulcan. When I opened up the battery compartment for the first time it seemed like one of the D size batteries had leaked and created a strange crusty white substance. I simply washed this out with water and proceeded to remove the air restrictor. After closing the gun back up it works as flawlessly as a vulcan can when using the manual priming feature, but when I inserted fresh batteries and tried to go full auto (yes I flipped the on switch), the gun didn't even utter a peep. I don't know if the battery leaking or my washing out the battery compartment has anything to do with it, and I've also removed the dividers in the battery tray and checked as well as I can for lose wiring, so I'm really just stumped as to why this gun refuses to work electronically.

P.S. Sorry my first post is so useless.