Clogged glue bottles - a real frustration when you have a group of 25 kids waiting for the glue! Remove tops and put into a bowl with 2 tablespoons of vegetable oil. Work oil into lids, rinse and put back on bottles of glue. The oil keeps the glue from clogging the lids. Haven't tried it yet but have 50 bottles of glue I will attack first thing after the holiday break.