Hey guys trying to clean my old cartos for the first time here and my two new premuims that i tried i couldnt get the plastic mouth peice off i tried dipping them in the boiling water to losen the glue but no luck then i pryed and pryed and they just broke? any ideas what im doing wrong?

I don't know why I find this so funny Keyz, maybe just because I understand the sheer frustration of it.