Clear Messages From Queue By Subject Line - SSH

Due to spammer activity, I find myself with 20,000 messages in the queue and I'd really like to remove those emails from the queue as it is causing delays to good messages.

Can you give me the SSH command to remove messages by subject line please?

I have already used
exim -bpru|grep frozen|awk {'print $3'}|xargs exim -Mrm
and
exiqgrep -i -f '<>' | xargs exim -Mrm
and
exim -bpu |awk '/nobody/ {print $3} ' |xargs exim -Mrm

But there are still 11,000 messages left in the queue.
The spammer messages have the following subject lines:

IS THIS TRUE?
PAYMENT UPDATE
Online Banking Account Is Locked !
Online Banking has been locked
ARE STILL ALIVE /THIS A SAD NEWS ABOUT YOU