Bottom line - some people have success cleaning AND drying them. Drying them is the trickiest part. And even then, they may not taste good. So unless you personally have had success cleaning and drying them, then don't count on it.
The way I use cartos is this...
Prefilled samples - If I like it or at least don't hate it, I top off with a different compatible juice and keep it damp. I reuse it until it's performance or flavor gets bad. If I cannot stand to vape it, it goes in a bag and maybe some day if I am desperate I will try to clean them
Blanks - I never ever test juices in cartos. I use a manual battery w/ atomizer and drip tip to test my new juices and samples. When I find a juice I really like, it gets a carto. And then I keep that carto damp and keep using it as long as it works well. Then it goes in the bag.
I usually alternate vaping 2 main cartos and a couple of occasional ones. I can get 3-4 weeks use out of a Boge carto if I use a thin clear juice. V4L cartos seem to degrade a bit faster but I can get 1-2 weeks out of one if I use thin sediment-free juices like their WOW juices.