What's the measurement of baking soda to water? 1 tsp/cup? Also, what's IPA? Hopefully I don't need to do it some day.
The amount of baking soda to water isn't really critical, you are just using it to neutralize the acid from the batteries, and will just wash the excess away.
By IPA, I presume that bvanant is refering to isopropyl acohol, which is commonly sold in the US as "rubbing alcohol". This will help remove all the water from inside the case, and allow it dry fully.
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