I don't know anywhere near everything about Computers but if you post here about your HD not working after you do what you posted.......sorry.
That's pretty crazy. I don't recomend it. LOL
brad
I have never put a hard drive through a dish washer, but I have washed plenty-a-keyboard this way. It actually works quite well if you can leave the keyboard to dry for a couple of days near a dry heat source. I just use my "spare" keyboard for the drying time