Went into the washer - Any chance to salvage it?

@alveron problem here is "letting it dry for a week" which will only contribute to more corrosion. There is always hope to fix it and you do not have anything to lose at this point. You must totally disassemble your phone to clean every part with some 90++% isopropyl alcohol (professional ultrasonic cleaning would of course be better. I assume you do not have access to that) Use this guide for an idea on how to clean it. It was written for an iPhone but all the points are still pertinent to your phone as well. Once cleaned and checked for damaged components, you must replace the battery. then reassemble your phone and re-evaluate. You cannot properly troubleshoot your phone until you have cleaned and minimized the damage.

You may get answers that are referring to "rice" please disregard those as that is only a myth and will not work.