I have a bunch of empty cartos I have left open during a home move. I decided to wash some out for refill yesterday after they have laid open for a couple weeks. Some of them seem to not wash out now with air only passing through the battery hole and not through the filling material. I think maybe the remnants of the old juice have dried up in the filling material and now may be ruined. has anyone experienced this? I'm wondering if a good soak in alcohol will soften the residue back up and allow me to wash them out and continue re using them or are they done for?