I have not yet received a response from the original poster from the
first thread on this subject, but I asked the question to a group
dedicated to research etc. of biodiesel. This the response I received:

<<<<<
Thanks for writing.  Biodiesel is a good cleaning agent (it is used by
some in place of safe T Clean solvent in parts washers), but it does not
evaporate so it leaves a film. 

National Biodiesel Board
Jefferson City, MO, USA
www.biodiesel.org
>>>>>

I plan to pick up 20 gallons of B100 the end of this week and refill my
parts washer this weekend. I'll pass on my opinions after I clean up a
nasty carb I have to remove from a roto-tiller.

David Higginbotham
82 Westfalia
Silk Hope, NC