IQねた。何気に眺めてたらこんな公式の書き込みが。
ええっと思ったけど、日々のメンテでシリコンを痛めるより良いのかもね。
要約は、チャンバー裏の掃除はiso入れて両端指で抑えてシャカシャカ。長文貼り付けですが追記も面白いので勘弁。

To all inquiring about the best way to clean this area, the q-tip route is a good way to go, particularly if you are diligent in cleaning your vape.
However, I know (I see some of the RMA's ) that not everyone is.

The entire vaporpath is sealed from electronics, so you can literally remove the flavor chamber.
Plug the bowl area with 1 finger, spray some ISO into the flavor chamber area, plug that with your other finger and shake. It will release any build up on there.
I do caution people to not do this as their normal cleaning routine as it will eventually degrade the silicone seals- but it's good for a monthly deep clean.

PS- why we didn't think of this sooner....I have no idea. I saw my tech doing this and was mind blown.