So cleaning it won't help?
There are people who do clean them, but I'm not one of them. There's nothing like a fresh carto, IMHO. However, if you really want to (or need to) clean them, go you Youtube and look for cartomizer cleaning techniques. Maybe they'll work for you.
The only cleaning I do, on a rare occasion, is a PG flush (or my version of it). Fill your carto with some unflavored juice (mostly PG or 100 PG%), vape it for a while (you don't need to inhale if you can't stand the taste), refill again with pure PG and leave it overnight. PG is a solvent and it will remove some of the gunk from your carto. Then just blow out the PG (or do a reverse Taryn spin) and slowly replace the PG with your regular juice.
But honestly, not worth it.
You can try but for less than $2 I find it just is not worth the effort. On the Boge you can move the element a little and get it to fresher wadding. Pop the cap and look for the black lead wire. Use a small screwdiver or other strong narrow pointed object, lift up on the wire a little and work it to the left or right. Do not apply to much force and if done right it will produce that nice popping sound again.
Not for the faint of heart.
