You can try to dry the inside of the keyboard by taking the end of the key board off.
Take a hair dryer and place it at the end of the keyboard and let the air dry out the fluid this may take some time depends on how much fluid you have inside.
Do not use the dryer on high because the heat will warp the bed the keys fit into, this will damage the board which cost about $ 400.00 to repair. Do not turn on the key board while the fluid is still inside this can also damage the keyboard. I belive you have already turn it on because you said eight keys do not work.Do not open the keyboard because the keys will be hard to put back in the grooves the way they were.
You can try and have it repaired at American Perfect Crystal Corporation
Casio Parts Distributor 520 Eight Ave. 2nd Floor
New York, New York 10018
212-246-8292
800-345-0537
[email protected]www.americanperfit.com
They will charge about 50-89 dollars to check it for you and if its reparable the checking fee will go toward the repair.
I wasted kool-aid in my casio privia while the keyboard was off, but made a grave mistake because I tried to repair it my self with the hair dryer at a high level. I was told that the major board was warp, that being said try not to do self repair.