Wear gloves
Dust the brass with a soft cloth
Wash with warm water and mild dish soap
Rinse with clean water
Dry immediately with a soft towel
Apply a brass cleaner or polish
Rub gently with a soft cloth
Buff until shiny
Use lemon juice and baking soda for tarnish if needed
Rinse and dry again
Avoid abrasive pads or harsh chemicals
Test any cleaner on a small hidden area first