Pardon my ignorance, but what the h###ll is "salt wood"?
It was an ill-fated wood curing process that was used primarily by Browning that didn't work out so well and resulted in a lot of rusted guns.
It was, I believe, their supplier that used the process to speed up the delivery of blanks to customers. Winchester also got a few, I've read. The mess almost sank Browning.
From what I've read, the only safe thing to do is restock, as efforts to de-salt and/or seal off the salt generally fail. Some have succeeded, perhaps, but not many.
The problem scares me away from a lot of internet auctions of nice Brownings. Some sellers state that their items are salt free, but I've also had some decline to even answer a question about it.