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Wipe it off and then take a warm very lightly soapy cloth to it then wipe the soap of quickly with warm water. It worked for me and splattered soup.
 
One time, my friend's brother spilled a vat of jello over his iMac G4, and it went into Kernel Panic. Coincidence? I THINK NOT!!!!
 
The only way to cure this "problem" is to gently remove the sauce by dabbing it with some fresh, delicious Italian bread. This should go down nicely with some red wine and a DVD of the Godfather while simultaneously saving your MBP.
 
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