Interesting little fact. SN95 Convertibles are designed to dump water into the interior, and then drain that water out. The back of the top area has no drainage, so the top is designed to create a little "moat" that channels the water all the way around and dumps it down into a pocket under the rear quarter windows.
Water pours off the top and down into these pockets roughly here
There is a drain for each pocket. One on each side. Just ahead of the rear tire. it's really just a fold in the spot-welded sheetmeter, and not a tube
Roughly the area you will find the drains under the pockets
You need to clear these. Pipe cleaners work but compressed air shooting up might be better. Problem is if they are full of crud and leaves, it will clog up again. In that care you need to pull the interior panels and the rear speaker pod area out and get in under the window and clean the pocket up.
When these don't drain properly, the water fills the pocket and flows out behind the rear seat into the passenger footwell area. It can also flow up the side floor channels and flow out under under the doors into the carpet area.
You might notice water flowing from these areas if you pull up the carpet