Yep, it's definitely a fake, with a "mule" design: the obverse is of emperor Hadrian, but the reverse was used only on coins of emperor Trajan.
Here's one just like it on the FORVM fakes database.
Cleaning it? Sure, why not. You could try pretty much anything. A proprietary brass polish ought to work, but the surface is going to be very rough, so you might try a buffing brush instead.
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I have an old coin my father bought in egypt back in the late 70's...
Even back in the 1970s, selling genuine ancient coins to tourists was illegal in Egypt. Selling "tourist replicas" to them, however, was perfectly legal. This "coin" is a typical tourist copy.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis