If you prefer to hand wash your shower curtain, simply sprinkle baking soda onto a dampened microfiber cloth.
Then scrub down the entirety of your shower curtain, lightly at first, leaving highly stained areas alone for now.
Rinse the shower curtain with warm water to remove all traces of baking soda and then get a clean cloth.
For any remaining stains, sprinkle baking soda directly onto your cloth and then scrub at the stain with soap and baking soda.
Rinse the shower curtain off once again and then replace it on your hooks.