[Exim] How do I delete frozen messages?

Okay, it's a dumb question, but I've gone through the docs, and searched for
"delete" and "remove", and gotten nothing that seemed pertinent. The
messages are frozen 'cause the remote site is bogus, so I don't want to
bother with an "exim -qf", but I don't know where to go. Do I just delete
them by hand from the spool directory? That seems inelegant, but, if it's
the "proper" solution, no biggie... but I do want to be sure I'm doing The
Right Thing.

Thanks!

Ken D'Ambrosio
Sr. SysAdmin,
Xanoptix, Inc.