gunking coils

My girlfriend is constantly getting massive build up on coils and burning her cotton. I can go a couple months on my wicks but she is lucky to get a week out of them. I've tried different decks and coils but it is still happening. I've told her to squonk more often but it doesn't seem to help...

Hey guys i have a Smok cloudbeast on a smok 220w alien. I am using T10 coils but have used the 8s and had this issue as well. While vaping the slots where you can see the cotton through the glass will turn black, then eventually dicipate. When changing coils they are FULL of black gunk im using...