Mine

on *:TEXT:!clearban:#:{
if ($me isop $chan) && ($nick isop $chan) {
  echo $active Clearing bans on $chan
  var %i = 1, %bans
  while (%i <= $ibl($chan,0)) {
    %bans = %bans $ibl($chan,%i)
    if ($numtok(%bans,32) == $modespl) {
      mode $chan - $+ $str(b,$numtok(%bans,32)) %bans
      %bans = ""
    }
    inc %i
  }
  if (%bans) mode $chan - $+ $str(b,$numtok(%bans,32)) %bans
}
}