If it's only kerosene, simply hang the item outside and permit it to dry. This could take a few days in cold temperatures, an afternoon in warm summer sun. If it still has an objectionable odor or has a stain, get it dry cleaned.
It it is unwashable, I would check with the drycleaner. We use kerosene heaters in our home. I spill the stuff all the time. It is oily. The best way I know to attack oil is to use a liquid dish soap or detergent straight on the fabric and gently work into the area. The soap cuts the oil. Then rinse with water. Never use water first. Some wool can be washed in cold water. If it is a small area, you could try a bit of soap and then rinse carefully with cold water. Make sure to reshape it and let it dry flat.
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