Put the cartridge of yours on the hot plate to take away any residual alcohol. Put out the THC vape juice into a glass baking tray and clean your cartridge with rubbing alcohol. Wipe some spills with a little gauze. FAQs About THC Vape Cartridges. Be sure that your cartridge has dried up entirely before adding additional liquid. For perhaps the most part, we'd advise buying a THC vape cartridge...