Dip

The Dip is a ghastly green chemical from Who Framed Roger Rabbit. It is a mixture of the paint thinners turpentine, acetone and the petochemical benzene. While it is relatively harmless to humans (as Eddie Valiant was seen running through an ankle-deep pool of it), any Toon that comes in contact with it will melt slowly and painfully, and is apparently the only surefire way to kill a Toon. As a well-deserved poetic justice, Judge Doom ends up being melted himself near the end of the film, after revealing himself to be actually a Toon. He also invented a vehicle machine called "Dipmobile" which would have dissolved all of Toontown into oblivion. Fortunately, it was destroyed by an oncoming Toon bullet.