Do not leave your leather untreated, otherwise it gets dry and becomes brittle.

Here is how to keep it soft and clean:

• clean your collar or lead with a soft cloth removing first dirt
• lead / collar should be dry
• apply saddle soap (not standard soap)
• wipe down and rub mixture onto surface
• allow the leather to absorb
• buff the leather aftwards with a clean dry cloth

Brass products can oxidize, and due to this, they can darken. This is not a manufacturing defect but a natural property of brass.

• cover the leather parts of your collar or lead with a tape or cloth
• for brass cleaning use gentle commercial brass cleaner or vinegar essence
• use a clean soft cloth and apply the brass cleaner / vinegar
• rub / polish carefully (without touching the leather) the brass parts

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Little homemade recipe for brass polish, which also works on corroded brass:

• Mix 1/2 cup of vinegar, teaspoon of salt, sprinkling of flour until it forms a paste.
• Spread the paste on the brass. Allow to sit for a few minutes.
• Rinse gently with water and dry.