The ones I had did have air holes in the very bottom, but I guess different brands have different designs. I tried cleaning the ones I had with rubbing alcohol, and it did help for awhile, but went bad again. About the only thing you can do is get a different setup that uses a fire button instead of depending on air flow to fire it. Don't know about the one you have, but mine had a hole through the middle of the contact pin for the air to flow, that's how juice got into the electronics.