We find it best to clean it out after each use with a Tidy Tip.
If it gets too dirty, soaking in a super soaker will help clean it. Alcohol works great, but to get it, even more, try resinate.
Never heat alcohol in a microwave for more than 10 seconds.
NEVER EVER heat alcohol in a sealed container
NEVER EVER breath the fumes from alcohol, this is why we say do not heat alcohol, Its better to just let is sit longer. We only mention the 10 second thing as people have been heating for a long time. We just want you to be careful as alcohol can cause you to go blind and damage your lungs. ISO alcohol is NOT the same as the alcohol you drink.