I appreciate the responses and varying perspectives. I noted the
cautions from the EPA about ozone effectiveness at "low" levels and
toxicity risks, although as noted using an ozone generator inside a
closed car could easily exceed safe ozone levels for inhabited spaces
and should mitigate that risk. I'm skeptical about wet vacuuming and
HEPA vacuuming because of my concern that mold may be deep inside the
car upholstery. No doubt such a method would be less radical but might
not be effective.  But I don't KNOW that, either, having no experience
in this area.

If I decide to go with an ozone generator to kill the mold and the odor,
do I have to buy one or are there reputable sources where one may be
rented or applied by professionals?  I'm in NH, as noted earlier, which
is lovely and all but may not have a high concentration of technicians
for such things.  It's easy to Internet browse and find sources to buy
an ozone generator, but if I went, say, to the exotic used car dealer
nearby would they be likely to have such a thing and would that be a
viable means of getting the machine or treatment?  I'm perfectly willing
to do research and legwork but would much appreciate having the benefit
of the knowledge of others.
Thanks again --
WC