Check the brass to see if it is indeed lacquered. Lacquered brass does not tarnish and will have a clear coat on it.
Dilute one squirt of dishwashing liquid in a bowl of water. Soak a clean cloth in the soapy water and squeeze the excess out.
Wipe the brass with the damp cloth.
Remove any water or residual soap with a clean cloth.
Add a drop of mineral oil to a new, dry clean cloth and rub it on any stubborn dirt or grime.
Check to see if the brass is lacquered or not. Any signs of tarnish or corrosion are unlacquered; when in doubt, use a conservative cleaning method designed for lacquered brass. Mix a homemade cleaner of 1 cup of vinegar and 2 tsp. of sea salt and add flour to make a thick paste.
Rub the paste on all parts of the brass and leave it there for 10 minutes to soak in and dry.
Wipe the paste off with a damp towel then buff any residual paste off with a clean dry cloth or home buffer.
Cut a lemon in half and dip the pulp side in sea salt. Rub highly tarnished areas with the lemon to remove any corrosion.
Clean residual lemon and salt with a damp cloth. Buff with a dry cloth until the brass is shiny.