A simple editor which reveal hidden component, and lets you delete it.

HiddenComponentViewer.cs

using UnityEditor;
using UnityEngine;

public class HiddenComponentViewer : EditorWindow
{

    [MenuItem("Tools/HiddenComponentViewer")]
    private static void ShowWindow()
    {
        var window = GetWindow<HiddenComponentViewer>();
        window.titleContent = new GUIContent("HiddenComponentViewer");
        window.Show();
    }

    GameObject target;

    Component[] componentCache;

    public void Refresh()
    {
        if (!target)
        {
            componentCache = null;
            return;
        }
        componentCache = target.GetComponents<Component>();
    }

    private void OnGUI()
    {
        EditorGUI.BeginChangeCheck();
        target = EditorGUILayout.ObjectField(target, typeof(GameObject), true) as GameObject;
        if (EditorGUI.EndChangeCheck())
        {
            Refresh();
        }

        if (componentCache == null) return;

        foreach (var component in componentCache)
        {
            if (!component.hideFlags.HasFlag(HideFlags.HideInInspector)) continue;
            
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField(component.GetType().Name);
            if (GUILayout.Button("Delete"))
            {
                Undo.DestroyObjectImmediate(component);
                EditorUtility.SetDirty(target);
                Refresh();
            }
            EditorGUILayout.EndHorizontal();
        }
    }
}