There are drain ports on each side of the car where rain drains off the ragtop and goes to these two drain ports. You have to drop the top about half way down and you will spot them under he top where the frame members are exposed. They are kind of rectangle in shape. I ordered a "trombone cleaner" on ebay. About 5 to eight bucks. A long plastic coated wire with a brush on each end. Feed one end down the rectangular drain hole. You have to jiggle it a little to go through. It should eventually go through the bottom of the car and out to the ground. These drain tubes can get clogged up with debris and dirt. When clogged the rear floorboards can fill up with rain water.