Wipe the white brass belt buckle with a soft, dry cloth after wear to remove oils and moisture. Avoid prolonged contact with water, salt, perfume, lotions, and household chemicals, as these may accelerate tarnishing. 

Keep your leather belt strap clean from dust, dirt, and oils by using a mild soap solution or gentle leather cleaner with a dry microfiber cloth. Allow the leather to dry naturally. 

It is best to store your leather belt in a cool dry place, and avoid leaving the garment in direct sunlight for long periods of time.
Consider taking the item to a leather care professional for deep cleaning, conditioning, or repair if it’s heavily worn or damaged.