FlushTheJohn.org volunteers investigate, identify, and publicize the conduct of adults who solicit prostitutes for sex online. The site consists of 3rd-party volunteers who carry out sting operations by posing as prostitutes on sites known for being used to prostitute.
It appears they have no removal policy but rely on third party paid arbitration services to remove your name if you are listed on that site.
Direct Link: http://flushthejohns.org/removalfaqs/
They claim Truth in Posting can remove
If we get any more information we will post on FlushtheJohns.org