AA batteries leakage and the threaded lid won't open
I have the latest wireless bluetooth keyboard, I left two AA batteries inside and haven't used it for about 2 month until I found that there's a battery leakage ( some white corrosion is outside the threaded lid area), so I immediately tried to open it but the corrosion joined the parts together so strongly. I used a coin with a hold of pliers, the coin got twisted. Then I tried with a screw driver and there's still no luck.
So I took it to an apple-appointed service center, they basically did the same thing and couldn't open it either, in the end, they told me that there's nothing they can do about it.
It's funny that the service guys can't even open a corroded lid, on the other hand, I can there are so few people who are as forgetful as I am.
I wonder if there's any chemical product I can use to dissolve the corrosion and loosen the lid. Please advise!!! Thanks!