The drain hole is between the wing/fender and the main body. I think this was covered in a previous video. If you want to clean it out properly, you will need to remove the bolts at the bottom to give a little gap and then get a pressure washer to blast the build up of crap out. Chances are, you may also have some rust problems behind there so I would recommend removing the side skirt so you can lift the bottom of the wing enough to get a good look. Early detection and prevention now will be better than the misery that will be caused if the rust breaches the sill or floor pan.