I have a volumatic spacer which I use to take ventolin if I ever need it. I have used it this week as my asthma flared up due to a virus. I have notice that it has developed a ring around the inside. (I keep it in a bum bag to carry around when I am out and about)
I have left it in soak in a my kitchen sink. Is there a safe way to remove it. Or do I need to get a new one.