So, I'm looking for some cartridges that won't hold the flavor of the e-liquid when it's empty. I want to perfect a recipe and need the cartridge to be perfectly clean when I try a new recipe. For example, I want to make 20 different recipes and try them all without being getting the flavor of the e-liquid that was in the cartridge before. At the moment I am using a cheap pen with the 510 threads.....I think. My cartridges have the wicks in them and I'm afraid that that will be hard to clean in between times I try new recipes. I guess it's called a clearomizer. Would a Atomizer me good for my use, and if so, is there a place to buy them cheaply? Thanks!