If you stick your naphtha in the fridge for an hour or so before you put it into the freezer to crystallize, you can easily pour off the naphtha and separate the goo before it causes any trouble. It seems that a lot of people have difficulty working with this goo, but I didn't see anyone mention the fridge idea.

PS - If you want to keep the goo, you can still put it in another container to evaporate while the magic is happening in the freezer.

Hope this helps