As RudyS said, vapor degreasing with a solvent that will not react with your
aluminum casting would be a quick and easy way to get these large parts
cleaned. Re dielectric, many of the halogenated solvents will provide a high
dielectric environment is left behind. One client used to test high voltage (ca
10,000 volts or greater) interrupter assemblies by operating them in a bath of
CFC-113, but have switched to perchloroethylene for this procedure.
Instead of a PWB house, I would suggest going to a contract cleaning house
that has a number of cleaning options available; both on a test and production
scale. You may wish to start with PCSI (www.partscleaned.com) in KY. They are
set up to serve with both cleaning and cleanliness testing capability for
anyone who would like to outsource this manufacturing function.

Bill Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO   80526
Tel: 970.207.9586   New Cell: 970.980.6373

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