Script to clear FX prefab

ClearFxPrefab.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace Utils
{
    public class ClearFxPrefab
    {
        #region Methods

        [UnityEditor.MenuItem("Tools/Clear fx Prefab")]
        protected static void Clear()
        {
            GameObject[] selectedPrefabs = Selection.gameObjects;
            foreach (GameObject selectedPrefab in selectedPrefabs)
            {
                if (selectedPrefab != null && PrefabUtility.GetPrefabAssetType(selectedPrefab) != PrefabAssetType.NotAPrefab)
                {
                    bool hasChanged = false;

                    // Get all child lights
                    Light[] childLights = selectedPrefab.GetComponentsInChildren<Light>();

                    // Destroy child lights
                    foreach (Light childLight in childLights)
                    {
                        if(PrefabUtility.GetPrefabAssetType(childLight.gameObject) == PrefabAssetType.Regular)
                        {
                            hasChanged = true;
                            Undo.DestroyObjectImmediate(childLight.gameObject);
                        }
                    }

                    // Get all components
                    Component[] components = selectedPrefab.GetComponentsInChildren<Component>(true);

                    foreach (Component component in components)
                    {
                        if (component.GetType() == typeof(Transform))
                            continue;
                        if (component.GetType() == typeof(ParticleSystem))
                            continue;
                        if (component.GetType() == typeof(ParticleSystemRenderer))
                            continue;

                        if (PrefabUtility.GetPrefabAssetType(component.gameObject) == PrefabAssetType.Regular)
                        {
                            hasChanged = true;
                            Undo.DestroyObjectImmediate(component);
                        }
                    }

                    // Save the changes to the prefab
                    if (hasChanged)
                        PrefabUtility.SavePrefabAsset(selectedPrefab);
                }
            }
        }

        #endregion
    }
}