hardware knobs

hardware knobs

What should I use to restore the doorknobs of age?

I have a turn of the century apartment with very old doors / buttons. They are beautiful doorknobs, Victorian style and was wondering if it would be more effective in removing command and enjoy some kind of chemicals, or simply brush to death with something. I will not damage the wooden doors and Brasso was not doing the trick, industrial need something for these babies. Any type of chemical I can use? I just got frusterated in search of these things at the hardware store. Thank you!

They are made of glass or brass???

Is design-wise or brushed nickel to make the whole house, but with oil rubbed bronze lighting and hardware