Water coming out of floor vent

When running the A/C I get water coming out of the floor vents. A few weeks ago, my wife parked the car under a tree for about a week and when she came home is was covered in little blooms. In the door, trunk lid and under the hood. It had rained a few of those days.

I filled a shop vac removing all the crud. It had accumulated a lot on the air intake just below the windshield.

I have noticed that it is not draining much water under the car as before.

I think that the drainage is blocked and water is overflowing into the air ducts and running out the lower vents. The water is clear. Is there a drain hole somewhere and how can it be cleaned. I have looked under the car for a drain hose but did not find one. There appears to be a sheild where the water drips from under the car.

Any help?

Thanks.

R.