private void CleanUp(ClientContext ctx)
{
    List _requestList = ctx.Web.Lists.GetByTitle(Lists.SiteRepositoryTitle);
    ctx.Load(_requestList, p => p.EventReceivers);
    ctx.ExecuteQuery();

    var rer = _requestList.EventReceivers.Where(
        e => e.ReceiverName == RECEIVER_NAME).FirstOrDefault();

    try
    {
        System.Diagnostics.Trace.WriteLine("Removing ItemAdded receiver at " + rer.ReceiverUrl);

        rer.DeleteObject();
        ctx.ExecuteQuery();
    }
    catch(Exception _ex)
    {
        System.Diagnostics.Trace.WriteLine(_ex.Message);
    }
}