What's a typical life for a carto? I just started using cartos last week with a Liquinator tank. On day 7 of this carto and maybe 20-24 ml of juice through it. Drew is getting a little stiffer and not as much vapor. Almost like a weak battery but it's not as it felt the same on my freshly charged 18650 this AM. Not lacking in satisfaction, just performance seems to have dropped off a bit. Is this typical life? Can I clean a carto like an atomizer? Should I? Or just let it ride until it drops off too much or dies and use a new one? Thanks!