this post was submitted on 13 Oct 2025
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Fun fact: that's not how humidity works. It, in fact, DOES help to get water to evaporate by forcing the local humidity around the phone to stay low. Otherwise you may as well say all the people doing 3D printing that use desiccant to keep water out of their filaments are fools, too.
What it won't do is magically erase any gunk or minerals that were in the water that can short out traces on unprotected PCBs and chips even with the water gone.
So, yes, it is not magic that can fix any phone that saw water. Though it absolutely helps to get the water out of the phone. ... I mean, unless you live in a desert where the humidity should already be sufficiently low most days.
Dealing with humidity is one thing, but it's terrible at drawing "whole" water out of something.
And it's not the water that's the problem, it's like you said, it's the gunk and minerals it leaves behind.
Isopropyl alcohol will push water out of any cracks and crevices, if you're able to submerge bare boards in it. If you do it before the minerals have a chance to dry and corrode, it will get pushed out with the water.
Again untrue whatever you think is "whole" water, any dessicant will absolutely undoubtedly help with evaporation.
Not every person is tech savvy enough to open boards. Advice for most novices is still put phone between dessicant to get water out of the device is valid and good advice.
Would using isopropyl alcohol be better option? Sure it is. but telling my aunt to do it, and device will probably die because she doesn't know how to handle pcbs anyway. I'd much rather just advice using dessicant and hope mineral residue doesn't sort anything. And I'll continue with that advice forever.
But it doesn't help with evaporation. It actually prevents it by preventing air from circulating.
Bro you need to understand how relative humidity works. Evaporation is dependent on both air circulation and humidity gradiant. Now out of the two humidity gradiant is by quite a strong factor to the point where you can have very high air circulation of 100% relative humidity and you would see very little evaporation. Compare that a 20% relative humidity and no air circulation and you will see much more evaporation until relative humidity reaches 100%.
So what a dessicant does is take the relative humidity down by quite a lot in a sealed container and that forces evaporation quite a bit, and it will continue to dry the phone until relative humidity reaches 100% which will only happen once rice/desiccant has absorbed all the water it possible can at the given temperature and pressure.