I'm probably the last guy to try this, but it worked well.
I had a cam that the batteries died in and there was some corrosion. Put new batterie in and still dead.
Hmmm , scraped a bit on the corrosion and wasn't happy with it, so since the batteries were in a tray that pops out, I poured some vinegar in it. Foamed for a bit, then I rinsed it out with water and set it under the ceiling fan to dry.
Worked great!
So in case anyone else has never tried it, here ya go. LOL
I think if the cam doesn't have a battery tray, I would apply vinegar with a Q tip...