invalid byte sequence for encoding "UTF8"

We upgrading some old database (7.3.10 to 8.4.4). This involves running pg_dump on the old db
and loading the datafile to the new db. If this matters we do not use pg_restore, the dump file is just sourced with psql,
and this is where I ran into problem:

psql: .../postgresql_archive.src/... ERROR: invalid byte sequence for encoding "UTF8": 0xedbebf
HINT: This error can also happen if the byte sequence does not match the encoding
expected by the server, which is controlled by "client_encoding".

The server and client encoding are both Unicode. I think we may have some copy/paste MS-Word markup
and possibly other odd things on the old database. All this junk is found on the 'text' fields.

I found a number of related postings, but did not see a good solution. Some folks suggested cleaning the datafile prior to loading,
while someone else did essentially the same thing on the database before dumping it.
I am looking for advice, hopefully the "best technique" if there is one, any suggestion is appreciated.

Thanks,
Michael.

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