I just got this vape pen from the groupon deal as my first vape pen. I am wondering about the stock cartridge it comes with. Is this something that is reusable? Do I clean it after I switch oils? I don't really know any of the protocol nor can i find a useful guide. I just want to know how to care and use my Optimus 510 effectively and efficiently any information would be helpful that isn't one of the short unhelpful reviews I found on Google. Thanks! For example how to clean and maintain, any useful tips on what I should buy for it/use it with for best results those types of things. I just feel so lost in this new vape world.