After trying all methods of cleaning attys that I have read on this forum, I have found what works best for me. Run hot water through atty, blow attys out, microwave a coffee cup half full of water, drop attys in and let sit in water for several days and blow out. Then let dry for several days to dry. When I do a dry burn with these finished attys, they produce zero vapor...In my opinion this is a sign of a CLEAN atty. The taste is greatly improved. 
A clean atty is a happy atty!
A clean atty is a happy atty!