How can I delete an old post I left on someone else's Facebook wall? (in response to 'See Friendship')

This new "See Friendship" is not to my liking. It's too easy for people to snoop around.

I'd like to keep some sort of privacy on Facebook... yes I know I should just delete my Facebook... I want to keep it though as it is a good place to keep contacts. I don't post anything on anyone's wall anymore or have personal information on my Info tab, I only use it for sending/receiving messages. I've deleted all information I have been able to find including everything on my own Wall, events attended etc...

I don't see any way to do it, without having to scroll through a person's endless wall feed through several years of junk to find the post. Any way to perhaps jump right to itto be able to delete it? or completely expand a person's wall to ctrl-f your name and delete away?