You will be learning about the sun roof. Harbor Freight sells a small drain snake that clears the drains.

Additionally, I think stuff in the water gutters allows water to accumulate and overflow the gutters when you hit the brakes.

The sun roof is easy to remove once you understand how. The drains are in the corners. It is not necessary to remove the roof but it makes understanding easier.

A rifle cleaning kit is good for cleaning the rail slides to keep the roof closing under its own power without help.