Whatever electronics you wash, let them dry for a couple of days, with rice grain is a good idea or silica gel the easiest (more comfy option)
Generally, a lot of electronics will continue to work after being washed, dropped in water.
The problem is that often someone tries right away to get them on and hence fries them.
Second problem is that after a while as the plunge in soapy water does no good to some components and starts oxydizing and hence a couple of weeks or months the equipment will die.
Best thing todo is dismantle (first take the battery out) never ever turn it on, and then you should rinse it extensively with demi water to wash off whatever gunge or soap is still on the "equipment" a collegue of mine prefers alcohol (no not vodka ...) but take care most alcohols found in pharmacy have some form of grease in it (lanolin so take care) and then let it dry and dry and dry, first with a hairdryer to get rid of most of the water, it is not the temperature that is important but either the air speed to blow all the water away from the rinse. (so if have one with turbo on it choose it but with cold air works best for me) and let it dry for a couple of days.
To those freaking reading this, it was already washed, so what are you losing, except trying to extend the life and effectively saving whatever was washed.
Anyhow, hope it will eventually work out but I would start saving for a new pair anytime soon.
PS : Rinsing PL50 will not be very effective as it could be that no water entered the armature, but the contacts in the headshell could start to oxydize.