In re wetting; there are common chemicals much more hygroscopic than rice, though more reactive too. Once the corrosive environment is established by wetting then speed is of the essence.
I would remove the back and place the exposed KINDLE under a large bowl with the most hygroscopic chemical that you can find in a separate bowl adjacent to the KINDLE. If a small circulator, a fan, is available then I might include it.
In the event the KINDLE is wetted with a corrosive in itself mixture, seawater or dirty water, then judiciously rinse the wetted components with clean water and proceed as above.
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