Get some Brasso and start polishing. NeverDull (a wadding polish) does a fairly decent job, too. After you finish, wipe all of the residue off with paint thinner and put a clear polyurethane spray finish on it. That will keep it fresh and shiny for a year or two.
If you only soak the part in ammonia, that will remove the tarnish but it will leave the surface pitted and dull. You might want to soak it in ammonia first because if there was any lacquer on the piece, the ammonia will soften it up so it will come off easily.
I'm an old sailor, I know of which I speak when it comes to polishing brass.
Cotton tee's clean the easiest, and jeans are most durable.
LG computer monitors are easiest to clean
One can clean a brass table lamp by: applying rubbing alcohol (Isopropyl) to a light sponge and rubbing it against the lamp. Then wipe the lamp with the yellow cloth that came with the alcohol to polish it.
Assuming you mean, are the words "clean those brass" adjectives, the answer is no, maybe, and yes Clean is a verb. Those is a demonstrative pronoun. (Some people might call this a form of adjective, as it is a modifier.) Brass is an adjective: a brass trumpet, a brass bookend. Note that brass is also a noun in some uses: the brass on that uniform is shiny, the brass in this orchestra is very good
Easiest to clean is glass and steel.
There are a number of ways to clean outdoor nativity sets, but it depends on what the outdoor nativity sets are made of. For example, if the sets are made of plastic, clean the sets the same way as if you clean regular plastic items.
Most people consider aluminum blinds the easiest to clean.
you clean it
You can clean a brass telescope. Over a duration of time, brass starts to oxidize. To remove this, can use vinegar and salt. You can also use a concoction of chemicals that is premade, usually by a company that specializes in brass.
Use an antibacterial cleaner
http://home.howstuffworks.com/how-to-clean-furnishings3.htm
Silicone based nipples, as opposed to latex nipples are easiest to clean and will not hold a bad smell.