Fill a large container about half-way with gasoline (diesel works best).
Break a Styrofoam (polystyrene) plate into small pieces.
Add the pieces to the gasoline mixture and stir.
Pour out the extra gasoline leaving the white, jelly-like substance.

Bastard ♥♥♥♥♥♥♥♥ goblins ♥♥♥♥♥♥♥ on my lawn