You could have put it into alcohol as soon as you got it out of the toilet and removed the battery (which, with the HTC One, means breaking the back off and unplugging the battery), but by now, whatever started going bad has started going bad and alcohol isn't going to fix it. Alcohol just prevents things from going bad (it adsorbs the water [that's not a typo - adsorb, not absorb] and washes all the metallic and other conductive and etchant impurities from the water out of the phone). Next time, dump it into alcohol as soon as you get it out of the water and get the battery out of it. (Next phone, I mean - this one will probably die completely in another week or so.)
Leaving the battery in a wet phone is a sure way to kill it, which is why you'll never catch me with a phone with a non-removable battery. Current flows and parts get electroplated with metal that should be in other parts of the phone, even when the phone is turned off, if the battery is still connected.
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Wet Phone.