Why Soak when you can flush? I haven't tried to revive a hella old atty, but basic maintenance it seems to hold beans 
This is an improvised idea from a member here named Dogsbody with his cartomizer cleaning tip, but of course doing it to atties instead... see foot note
YouTube - cleaning a 510 atty by flushing
footnote: link to Dog's post: http://www.e-cigarette-forum.com/forum/tips-tricks/69499-clean-cartomizers-quick-easy-lol.html
I am not a Duck
This is an improvised idea from a member here named Dogsbody with his cartomizer cleaning tip, but of course doing it to atties instead... see foot note
YouTube - cleaning a 510 atty by flushing
footnote: link to Dog's post: http://www.e-cigarette-forum.com/forum/tips-tricks/69499-clean-cartomizers-quick-easy-lol.html
I am not a Duck