Hi all, I've got a question about cleaning blu batteries. I've got 2 kits myself, and also ordered a blu kit for my grandmother just to get her started on vaping. She's been smoking for 50+ years and I really feel like it's time for her to give it up. She really liked her blu when she first got it. Initially her blu's gave great vapor, but now, not so much. I maintain all of her equipment for her. I clean her atty's with highping's method and also clean the threading on her battery with isopropyl alcohol, but the past couple of days the vapor production has really dropped off. I'm wondering how one would go about cleaning the air intake hole that is in the middle of the battery, and how deep that hole goes. Any help would be great, I love my grandmother and want to make the transition to vaping as easy and as stress-free as possible. Pre-thanks!