Well... Remember that MC has a time window for a person to make edits to their own posts which stays open only so long. However, since I'm cleaning up Kermie's Girl for Aunt Catherine (both as a gift and because she permitted/asked me to do so) I could offer my services for a modest fee to do the same, take fanfics posted here and clean them up of any typos or grammatical nicks, then send the corrected version back to the author. Haven't gone full-scale with this plan just yet, still gotta finish other pressing demands like finishing scholarly duties.
Hope this helps somewhat and please post more of your great story.