Sometimes you can use spot remover and soak up some of the oil.

Cornstarch soaks up oil. So does finely crushed kitty litter.

Acetone will disolve it and make it soluable--but you still gotta soak it up with something. Maybe splash some acetone or alcohol down in there and then chase it with kitty litter to soak it all up.

When all else fails--rebuild from scratch.[]