It screws into a USB. I've filled it a few times before. Twice with the same flavor. I tried switching juices but it ghosts terribly. Can I clean the wicks or do I need to buy the "wick piece" every time I want to change flavors? I've noticed that I don't get as good of a vape as when I first bought it and I think the wicks may be the problem.
Ok, we know roughly what it is - a top coil clearo. The will come in two versions: the kind where the coil assembly can be unscrewed and replaced... and the kind where you can't do that.
If it's they type where the coil assembly can be unscrewed you will have some success removing it and soaking it in cheap vodka overnight. Long term, that only takes you so far.
Here, you need a basic anatomy lesson: Those long wicks have the wire coil wrapped around them, underneath that silicone cap that your drip tip snugs onto when you screw it on. Wicks draw the liquid up and through the inside of the coil, heat it, vapor comes out... and repeat. With use both the wicks and the coil build up residue from the flavorings and sweeteners in liquids. Over time that causes performance to drop. For a clearo designed like that you unscrew the coil assembly - if you have that option - and soak to remove what you can, but sooner or later you have to just replace the coil assembly. Soaking only cleans out so much.
As you figgered out - flavor transfer.
That type of clearo can only be cleaned so well - even if you soak the coil/wick part. They really are the kind of device you use for flavors you are committed to, not so good for sampling or switching flavors.
If you can show us an image of the connector end of the battery with the clearo removed, we can see what's what with the connector type and give you some suggestions for what may work better longer-term for a clearo. Like something with a glass tank that can be
fully disassembled for cleaning and will have a coil/wick assembly that is easier to change and clean. Don't know what they are charging you for coils for that one, but replacement coils for something like a Kanger ProTank can be had on-line in 5 packs for about $8.00