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You will have access to the drain hoses that attach to the rear of the sunroof assembly. From what I remember the hoses have a nasty black adhesive sticking them to the body and that stuff gets everywhere so try not to touch it. The above advice is good, but be extra cautious when removing the trim panels, at this age the plastic is brittle and may crack. The best thing to do is run a wire (old hanger) down the drain from the sunroof assembly, then you are sure to get any collected debris down and out.