The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the earbuds’ and case’s operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away
First do not try to charge or to turn on your earbuds and then remove the battery as soon as possible from them to minimize any further damage.
Then you need to dis-assemble the rest of the earbud asssembly (and also the case assembly) and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better
Here is a link that describes the process. Electronics Water Damage
As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board.
Hopefully after you have done all this the earbuds and case might possibly work correctly again.
Here is a link to the ifixit Samsung Galaxy Buds Live Repair guide, that may help for the earbuds, but the case will have to be opened as well and I cannot find a guide for that.
If this process seems too daunting, take your earbuds and case to a reputable, professional electronics or phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.
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