How To Clean A $1 Presidential Coin? And Should I?

Consider posting large and sharp photos of the coin--obverse and reverse. What we see could focus our responses.

Don't lose any sleep over that dark Presidential dollar .I'm sure you can get all you want from any bank . If you must have to have that particular coin looking brand new then scrub it with Brillo ; Whoa who said that ?
When your finished Detailing that coin , wipe it from your memory of how you cleaned it .

Just spend it. It will never be worth more than a dollar..

Since it's never going to be worth more than a dollar anyway, you might try treating it with nitric acid. However:

1. You might have trouble finding nitric acid.

2. If you don't dilute it first, it might react violently and spatter and create intense heat.

3. It will burn your skin and/or turn it yellow for several weeks.

4. If you get it in your eyes you might go blind.

5. Swallowing it may result in severe injury or death.

5. The red fumes you will create is toxic dinitrogen tetroxide and it will damage your lungs and/or poison you.

6. You will create a corrosive waste product that must be neutralized to dispose of it properly.

7. Use of any material other than glass or some plastics in the process is not recommended.

Having said all that, it's a whole lot of fun if you're in to that kind of stuff. Sometimes the most corroded coin will come out nice and shiny if you don't get in a big hurry. But don't leave it in there too long or it will disappear completely.