Alternate solution requiring NO WORK!
I noticed these hard to find drain holes cloking up...if it rains long enough or it sloshes around while your driving this water will accumulate in trunk.
OK, here is what I found out....it has NEVER FAILDED TO WORK for me!!!
Pore a 1/2 cup of favorite DRAINO drain clog remover into the areas that contain the water...the area under to convertible top lift mechanisim.
In minutes you should see water dripping rapidly from underneath the door area.
PS, I actually fill those same areas will water after they empty to clear out the remaining DRAINO....