Try these household products on the appropriate metal surface. Try a small and inconspicuous portion first.
Tamarind pulp
Soak tamarind in warm water, make a paste and gently rub it onto uncoated brass with a soft cloth. Rinse well and dry completely, avoiding prolonged contact to protect the finish.
Lemon and salt
Rub brass gently with a salted lemon half to remove tarnish, then rinse thoroughly and dry with a soft cloth.
Baking soda
Gently rub lightly tarnished silver with a baking soda paste and soft cloth. Rinse thoroughly and dry immediately.
Avoid abrasive polishing and ensure the utensil is polished appropriately.