I got a dishwasher recently, having never had one. I think I'm using it wrong as the little holder for the tablet doesn't open during the cycle. A I supposed to leave it open? Or put can you put the tab somewhere else like putting liquid in the drawer or the drum of a washing machine, can I just chuck the tab in the dishwasher itself? I've only used it a few times but the little holder only opened once! The dishes look clean but feel slightly tacky after. Help!