Ok so I have been using the vapor king for the past 9 days and it is working great. I saw the Riva on sale from this site so I ordered one as a back up "just in case". Anyway my package came today and it's an eGo..???.. Anyway no big deal, but they said they came with blank carts, but they are moist. What is in them??? Can I vape it??? Can I clean it out??? Instructions are lacking to say the least. Any help would be great