To clean chrome and remove rust without expensive cleaners use a sponge to scrub the chrome thoroughly with a mild soap and water solution.
How to clean chrome door handles.
Simply dip a soft rag into warm soapy water and wipe the grime away.
If stubborn dirt remains scrub the spots with a vinegar and water solution then dry the surface with a microfiber cloth.
Next dip crumpled aluminum foil into water and use the wet foil to scrub the rust.
Simply wipe your chrome hardware with a damp cloth.
Most door handles these days are lacquered or plated over brass or a mixture of materials.
Natural unlacquered brass real copper pewter and silver can be very expensive so most of us choose a lacquered or plated finish.
If you clean your chrome frequently a little dish soap and some warm water work just as well as commercial chrome cleaners.