Rubbing alcohol is fine... But use a 90% or higher version, and make sure it is just Rubbing Alcohol and water, not with the added crap. Here is my justification for Running alcohol... It is used in hosipitals and such to clean the skin before an injection. Thus, it hits your blood stream directly, and we have all lived and moved on unharmed from those shots just fine. By the time you vape it, it will be gone, evaporated. And if it is not, then you are still fine. I use it to clean my stuff, and I am doing just fine.