Products that contain simple alcohols,
like isopropyl or ethanol, are used in skincare to help accelerate the rate at which a product dries on your skin.
According to Byrdie, you should away from toners with synthetic fragrances, alcohol (also listed as ethanol or ethyl alcohol, denatured alcohol, methanol,
isopropyl alcohol, SD alcohol, and benzyl alcohol) and any cleansing properties (
like a cleansing water - in - one or a micellar water) as those can be irritating if applied too many times.
You can take the module apart (
like you already have), and scrub it clean with high strength
isopropyl, or even good vodka (but I feel this a waste.)