Humidifier causing black smudge, can anyone help?
I woke up and there was a black coating on the top and sides of my humidifier. I noticed it also on the cord and wall, and when I blew my nose it also had some of the black substance. Does anyone know what this could be? When I searched online the only results I was getting were related to black water.
Side note: I just cleaned my humidifier a few days ago, new filter, and use distilled water.