convertible water drain
From my experience, those upper drains do not handle much (if any water). Most of the water runs forward to the small windows, and pools in front of the wheel well. Dirt and debris also falls into this pocket. There is a drain that is very hard to see or clean. I could not find any access from underneath, although it may be possible. I lowered the top, lowered the windows. I removed the top plastic interior cover over the convertible top mechanism. I removed the interior window rubber weatherstrip. (both pull off). Looking straight down alongside the window, near the door, there is a plastic plug sticking up about an inch through the bottom of the car. You need to be looking more toward the interior than the exterior sheetmetal. It is maybe 3-4 inches back from the door. It is very dark and there is almost no angle to see it clearly.
I used a shopvac, with 5/8" heater hose, and 1/2" bendable copper tubing to get down there to clean it up. I also attached a toothbrush head to an aluminum arrow shaft, and used that to scape around and loosen up any leaves, pine needles etc.
For light I would think a flexible fiberoptic light wand would be great (wish I had one). I used a mirror to reflect sunlight, or you may do better in the dark with a flashlight/droplight.
I know this is an old thread, but this seemed the best place to post this info. The picture from deathrat does not have the angle to see the area in front of the wheel well that I am describing. If anyone knows an easier way to clean these, let me know.