How did you clean it? My suggested procedure is to remove the back cover, remove the screws, push on bottom of battery to remove mid frame, carefully remove the motherboard (watch youtube videos on how to get to this point). remove cameras.
With water damage you don't have any warranty so it's worth trying the following
ideally:
-remove metal shields from the area closest to where the battery connector plugs in
-soak motherboard in distilled water for a few hours, while submerged scrub with a toothbrush
-dry/shake most of the water off, soak in isopropyl alcohol (99% ideally) overnight
-again scrub with toothbrush while submerged
-optional: run through ultrasonic cleaner
-dry out in desiccant, under incandescent light bulb, etc for a day or so. it's important to give it lots of time because some can be trapped under shields
-squirt some isopropyl on lcd connector ribbon cable area and lower charging port board, scrub with toothbrush, let dry
If this doesn't work, possibly try in this order:
-replace battery (very likely battery is bad after water damage)
-soak lcd assembly in isopropyl briefly and dry thoroughly
-remove plastic rear frame from lcd carefully (tough to do with out damaging, be very careful around bottom where the lower board buttons and ribbon cables are. Scrub with isopropyl the circuit board/ribbon cable area that is now exposed on the back of the lcd
-replace lcd with known good one
-sell on ebay or swappa "as-is/for parts"
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