Don't blow on the drains, it's easy to pop them loose. pour a small amount of water in each corner of the track and be sure that the water drains to each fender in each corner and does not back up or just drain into the vehicle.
If the sunroof is clear then this is most likely a windshield seal leak or possibly a blower case overflow when a/c is in use.
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ASE Certified, 10+ years experience, Lexus and Toyota Certified