When a person joins a channel you're on and they have the same wildsite as another person, this will echo back to you exactly what channel the clones are in, at what time and the clone's hostmask. Just paste this script into your remotes and you're good to go.

on *:JOIN:*: {
  if ($ialchan($wildsite,$chan,0) > 1) {
    var %i 1
    while ($ialchan($wildsite,$chan,%i)) {
      tokenize 32 $1- $ialchan($wildsite,$chan,%i).nick
      inc %i
    }
    echo -a 12 $+ $timestamp 4Clones12 detected in4 $chan $+ :12 $1- (4 $+ $wildsite $+ 12)
  }
}