Dropped pool in swimming pool

They may allow an out of warranty replacement:

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Out-of-Warranty Service

It's an trick to put a submerged electrical device in a box for rice for a day or two - the rice has a drying effect. Or, those "Do Not Eat" silica gel packets you see all around, if you can find enough. Or, buy a case of diapers, break out the active ingredient (the stuff that swells when it gets wet ...) - you get the idea. It ***** the moisture out of the phone.

Because (see post from WALTER-MILANO-ITALY) damage has already been done to the circuitry and battery. If all the water it not gone after 4 weeks you would have to be getting it wet again. You could lay it in a cabinet for 6 - 7 days and it would completely dry. The trick is don't turn it on and don't connect it to your computer or power.

But with chemicals, such as a CocaCola, (sucrose) you actually need to open the iPhone and flush it with distilled water, then dry it out.

My humble opinion ... feel free to shoot me ...

You have endured 4 weeks of "works for 3 or 4 days, then needs to be re-loaded from PC, but even then works funny ..."

I would have given up after 10 days (if that) and bit the bullet on a certified-as-functional replacement.

For me, a functional phone is worth more than a few cases of beer or a month's supply of cigarettes (or ... )

After 4 weeks it is most certainly dry without the aid of anything. And a note, the Silica Gel packets need to be new ones, not ones you find in boxes in your house.

I suspect that, if it is still browning out from time to time, that it is *not* all dry inside. There must be moisture inside, else why would it stop - and then restart?

I am not happy giving bad news but...

In pools you have water and additives, may be even oxidizing agents like chlorine....