If you removed the HD and the optical drive it would probably work. People have been cleaning electronics with water for a very long time.Put the laptop in your dishwasher, upside down, run it through a full cycle. A manual scrub and rinse will work also.
Remove it, shake out the excess water and let dry for 24 hours (A hair dryer can speed this up).
Verify it's fully dry, re-connect and it will likely work.
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