The only way to know for sure that the drains are working is to pour a small amount of water at each corner of the sunroof frame. If no obstructions, you will see the water exit just behind each front wheel well.

The best way to clear the drains is to gently use a piece of flexable wire, such as a copper half of low-voltage house wire.

To reach the plastic tube connected to the sunroof drain, you need to remove the panel of the A post. The tube is connected just a few inches below the bottom of the sunroof frame.

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Don't Chrome them; polish them