There are drain plugs in each side of the car in the tracks under the door.
Mazda miata convertible top drains.
If you find the inside under rear seats flooding after a wash or heavy rain your tubes are probably blocked.
When those drain plugs get clogged with road mud or pine needles or anything else that.
These drain plugs accommodate the run off of the convertible top as it comes down the side and back of the car and runs down the back.
Hopefully this will shed a little more light on.
The water in the caller s miata is not coming from the convertible top leaking.
Hope you find this video helpful.
I first tried forcing air into the miata s drain system from the top but this didn t work well since there are so many vent holes along the top of the system that it didn t give good compression.