Question

If you have a script that creates a particle system and then delete the script from the prim, the particles don’t seem to go away. How can I get rid of them?

Answer 1

This is because particles are considered a property of a prim, much like its textures. Therefore, you must add a script to the prim that clears its particle settings:

default
{
    state_entry()
    {
        llParticleSystem([]);
    }
}