Oxide - Clearing/deauthoring cupboard

I've done the Authorize part which was kinda easy.. but I cant get to work the Clear Everyone & Deauthorize
What I've tried for the Deauthorize

(I've tried many other ways but these two are I think the closest..)
Code:
List<BuildingPrivlidge> cbp = buildingPrivlidges.GetValue(player) as List<BuildingPrivlidge>;
foreach (BuildingPrivlidge p in cbp)
{  
   p.authorizedPlayers.RemoveAll(new Predicate<ProtoBuf.PlayerNameID>(player.userID));
   //or
   p.authorizedPlayers.Remove(player.userID);
}
About the p.authorizedPlayers.Clear();
What I want exactly is to clear all the authorized players(friends) from all the cupboard that I own.
Well it worked but my code was clearing the authorized players(friends) from the cupboard that I'm currently in range.

For the p.authorizedPlayers.Add it works as I want.. it authorizes my friends to all the cupboards that I own. However with the same code and just replacing the Add(......) with .Clear() it's not the same.

Thanks for any help,
PaiN