Welcome back to
vaping and Wecome to the Women's Room!
For good advice I would check the KR808 forum or the Vapor 4 Life.
I take the white cap off and the rubber ring out..I hold the cart under hot running water at the sink..then I blow the water out from the
threaded end and rinse again. You can let the cartos drain for a while or put them threaded end toward you in a small baggie, glove or whatever and spin That romoves any water so you can refill. After you fill the cart..put the ring back in and put the cap back in and put it back in the baggie..but threaded end away from you and spin again. This packs the jiuce down.
Alternate fill method use one of the rubber caps (condom) fill it halfway with your liquid and then plunge the carto cap side down into it slowly..watch the threaded end until the liquid statrs to bubble uo!
All these methods have video's in the V4L forum.