Before using the steam sterilizer, I wash the bottles, pump accessories etc using the baby cleanser detergent and put them in the sterilizer to steam. After sterilization is complete and when I am ready to use, I just take them out and use directly. U need not worry about the little residual water in the bottles etc as any bacteria or microorganism present in the water already been destroyed by the steam.
Me. I just use after sterilising