In a mixing bowl, stir Elmer's glue and baking soda, then gradually add the contact lens solution, stirring well after each addition.
The slime unsticks from the sides of the bowl as you add more contact lens solution. Stop when the texture feels right, stretchy but not sticking too much to your finger.
Stir in the spooky fun sequins, googly eyes to turn this into a ghost slime.
Store slime in an airtight container at room temperature.