I have a cart and atty that I've dedicated solely for use with my Atomic Cinnacide from TV. it's awesome stuff, but a severe pain to clean out of anything it touches.
That said, I have an atty-cleaning procedure that largely eliminates it:
1) Blow the atty out
2) Soak the atty in boiling hot water for 15 mins. Swish around a couple of times.
3) Drain, blow it out again
4) Soak again in boiling hot water for 30 mins, swishing now and then.
5) Drain, blow it out again
6) Let dry in a warm place for a few hours.
7) Soak in PGA for 15 mins, swishing now and then.
8) Drain, blow it out, let dry for an hour or so.
9) Do a dry burn.
This reduces the cinnamon enough to make the atty useable for other flavors. The remaining cinnamon will fade after a cart or so.