This simple Editor script adds a menu item for resetting your current PlayerPrefs data. This script must be placed in a folder where its immediate or grandfather directories is called "Editor".

ResetPlayerPrefs.cs

using UnityEditor;
using UnityEngine;

public class PlayerPrefsEditor : MonoBehaviour
{
	[MenuItem ("Tools/Reset Player Prefs")]
	static void PlayerPerfsReset()
	{
		PlayerPrefs.DeleteAll();
	}
}