ParticleCleanup.cs

using UnityEngine;
using System.Collections;

[Script(ScriptRole.View)]
public class ParticleCleanup : MonoBehaviour
{
    void Awake ()
    {
        StartCoroutine(CheckParticleFinishedAsync());
    }
    
    IEnumerator CheckParticleFinishedAsync ()
    {
        while (particleSystem.IsAlive())
            yield return new WaitForSeconds(1f);

        Sync.Despawn(this);
    }
}