Are you trying to catch the 6 million outside or just keep them out of
your house? For the latter, check around your foundation for small
holes they can get in, especially around windows.

The few that get in when you open your door are easy to catch by hand.
If it's hiding out of reach, let it be and hunt if down when it
reappears. If you're really frustrated, try a vacuum cleaner, you can
also suck up any spiders, flies, wasps that come in at this time of
the year.