This film is caused by the soap reacting with minerals in the water. (lisabronner.com)
You should not boil the water more than once, as this can change the concentration of minerals in the water. (thespruce.com)
The more minerals in your water, the harder your water and hard water makes some laundry detergent less effective, which means you will have a hard time getting your cloth diapers cleaned. (babytooshy.com)