Fill a container with a solution of one part laundry detergent to 20 parts water. Fill a spray bottle with the solution.
Spray the solution lightly on stains, and then blot the stains with paper towels.
Moisten a pillowcase and place the cashmere blouse in it. Sprinkle a bit of essential oil in the pillowcase, if desired. Use essential oil to give your blouse a fresh, clean smell.
Put the pillowcase in the dryer. Set the dryer on the tumble cycle and let it run for 20 minutes. Do not use heat; this may damage the cashmere.
Hang the blouse on a hanger to complete drying and remove wrinkles.