It's possible the ECU is fried, but I'm doubting it.

Newer engines can't tolerate direct contact with water like the older ones did just because of all the electrical systems they have. You should have left the engine running while you were washing it.

So here's what I'd suggest-

First, if you think the ECU is fried, pull it out and have it tested.

Second, start cleaning any and all grounds you can find. Pull the cap and clean the contacts on the cap and rotor. Then pull the coil to cap wire, clean them and make sure they're dry. Do the same with the power wire to the coil. Then pull and clean each spark plug wire on both cap and plug end. Also pull apart any and all plugs of any kind that you can find and clean them as well.

A bottle of electronic contact/plug cleaner costs around 3-5 dollars at your local parts store and it's ideal for this type of thing.

Start there and see if you get any results. Keep us updated.

Oh yeah, and check fuses and relays as well.