Rice is fine for water, but coffee, milk, coca-cola, etc. requires more intensive cleaning. Adding more water (distilled) might actually help at this point, although I prefer isopropyl alcohol for cleaning electronics and the like.
Built in battery is a huge problem in this case; with a mobile phone you can at least take it out immediately whereas the ereader you need tools to open it up first. You shouldn't power it back on before it's not absolutely clean & dry. A single short circuit in the wrong place will kill your device forever.
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