Thanks for the reply. I have found plenty of threads on drilling through from the inside of the car. However, a lot of those threads seem to suggest that often times the drain is not actually clogged and the problem persists until they are able to extend the length of the hose.
I would like to try the option that doesn't require drilling through anything if possible first. That is where I am lost, for those that have extended the hose length, how on earth do you get to it? I can see it from under the car, but there is no logical way I can see how to get to it.