I keep on writing them but get denied, even for items that are very old. I keep on getting the same thing, we have to report accurate,etc,etc. This is true but since goodwill letters sometimes work what is their justification for removing things then?
The myfico forum on rebuilding has links to templates.
GW lettters probably don't work very often. There's no real upside for the entity doing a removal. That said, they're cheap (free, if you're using email), and easy enough to send.