Newb here with some questions. :]

[poetofisis]

Correct me if I'm wrong, but is it absolutely necessary to clean a carto if you're not going to change flavors? If not, then might I suggest organizing them such that you continue refilling them with the same or like flavors until they simply go to hell on ya?

 

[hittman]

That's basically what I do. I use them with the same liquid until they don't taste right and then throw it away and start a new one.