You could try:
Code:
on @*:Join:#: {
  if ($ial == $false) { 
    .ial on 
  } 
  if ($chan($chan).ial == $false) { 
    who $chan 
  } 
  var %x = $ialchan($wildsite,$chan,0)
  if ($ialchan($wildsite,$chan,0) >= 1) {
    while (%x) {
      ban -k $chan $ialchan($wildsite,$chan,%x).nick You appear to be a clone.
      dec %x
    }
  }
}


That should kick ban anyone who comes in providing they have a clone in there.
Hope that helps.