How do I clean the buckle strap of Graco Nautilus 65 LX?

To clean the buckle, release it from its slot at the bottom by rotating metal retainer to side for easier removal. Soak buckle in warm water, agitate gently without fully submerging and press red button several times while submerged. Rinse, shake out excess water, air dry thoroughly before reattaching securely ensuring proper click when fastened.

From the official Graco Nautilus 65 Manual Booster Seat manual, page 95

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