Acetone is a solvent for CA glue. You can use a baby food jar of acetone to drop clogged CA glue tips in and they will come out completly clean in a little while. Sometimes a pair of pliars in nessary to remove the tip from the glue bottle but it will usually finally break loose and then you can soak the tip in acetone until clean. A few extra tips are handy to be used while others are being soaked. This method has worked
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