Boil a big saucepan of water and add a half cup of baking soda (but only one tablespoon at a time - it fizzes). Drop the filter in and watch the grease slide off. Rinse. (No need to repeat on other side.)
This is how I make mine except with baking powder. DIY Deodorant with simple ingredients YOULL NEED: cup coconut oil, cup cornstarch (or arrowroot powder for sensitive skin), cup baking soda, teaspoon essential oil (lavender and lemongrass are great!
Showerhead Cleaner … 1/3 Cup Baking Soda – 1 Cup White Vinegar – 1 Plastic Bag – 1 Large Bag Twisty Tie — Let Sit Several Hours or Overnight.