The stationary filter must be thoroughly cleansed after every use.  While any dish soap will clean the mask, I wanted a deep cleaning with less suds. Vinegar has been used for years to enhance natural cleansing while botanicals like lavender leave a fresh clean scent.
 
Bay leaves also have excellent properties. While I can not guarantee the ingredients in this cleanser, I can tell you that after using it over the past 12 months, the mask and filter are still usable and when compared to other filters, even when new, has provided the most clean, comfortable and secure feeling.
 
By the grace of God, I never contracted COVID-19.