alias delbans will remove all YOUR bans in the channel, clearbans will remove all bans in channel. Simple but effective.It's been done before, but...

alias delbans {
  set %chan- #
  set %ooo 0
  :start
  inc %ooo
  if ($ibl(%chan-,%ooo) == $null) { goto end }
  if ($gettok($ibl(%chan-,%ooo).by,1,33) == $me) {
    mode %chan- -b $ibl(%chan-,%ooo)
    goto start
  }
  goto start
  :end
}
alias clearbans {
  set %chan- #
  set %ooo 0
  :start
  inc %ooo
  if ($ibl(%chan-,%ooo) == $null) { goto end }
  mode %chan- -b $ibl(%chan-,%ooo)
  goto start
  :end
}