Clean window pleats – this is how you get them clean again quickly and easily. Fly droppings and other light stains can be easily removed with vinegar.
Pleated pleats should generally not be put in the washing machine. Specially coated and blackout fabrics cannot be washed. By the way, you can also get room doors clean and white again with a few tricks during spring cleaning. The only way the pleated blind becomes new again is by washing it, just not in the machine.