Help! im gonna be in so much trouble!!!?

I just spilled milk on my dads laptop! He is a preacher and uses it for power points and sermens and stuff....it is turned off and unplugged from the wall....the battery is out...the Milk was om half of the keyboard....there is milk under the key but I can't get to it...I help it upside down and got some milk out that way....help me! He is still alsepp so he doesn't know yet....I'm in tears right now! I'm so scared! What do I need to do???? My mom knows and she's up trying to remove more milk...! Help!!