there is no way to get pits out without complete rechrome. pits are caused by impurities underneath and metal must be striped, cleaned, and processed for rechrome - not a trivial or cheap procedure. the more you pay the better the job usually.
You won't be able to get them out but you can polish up the chrome pieces and make a lot of the pitting "disappear". You can use SimiChrome paste or you can use 0000 steel wool followed by a coat of paste wax.