Vegetable oil tracked onto carpet...Any Ideas?

My 3 yr old poured out a bottle of oil on my linoleum and basically took a bath in it..lol. (It really wasnt funny at the time.) Anyway, he and I have tracked oil onto the carpeted area. Its hard to tell just where it is and theres no stains, but the carpet feels a bit greasy to the touch. Anything I can do? I saw the thread where the oil was in a certain spot, but its hard to tell just where all mine it as it is just a light layer on the carpet...