Blot up any excess oil from the bluejeans, using a paper or cloth towel.
Pour heavy-duty liquid detergent onto the stain.
Rub the detergent into the stain thoroughly.
Wash the bluejeans in hot water with a normal amount of detergent. Only fill the washer basin with a limited number of other garments. If the washer is too full, the water will not be able to dilute the oil properly and may cause the stain to transfer to other pieces of clothing.
Remove the jeans from the washer and inspect the stain. If it's not completely removed, repeat the process to remove the stain. Don't place the bluejeans into the dryer until the stain is gone.
Allow the dirt to dry.
Use a butter knife to scrape dirt off the surface of the jeans.
Wash the bluejeans in hot water with a normal amount of detergent.
Remove the jeans from the washer and inspect the stain. If it's still present, pour a little detergent onto the stain and rub it into the jeans.
Wash the jeans again.