It depends on variety of factors. How will you do the work? How many are there? How difficult are they to remove and reinstall? How soiled are they and with what type of soil? What are your costs? How much profit and overhead do you need? And the list goes on.
Mini-blinds cleaned with an ultrasonic unit will be done quickly, but you have the expense of buying and maintaining the unit or contracting with someone else for the service. Sometimes transportation costs are involved. Washing them ... — Lynn Krafft ICAN/ATEX editor