Found my first tax token yesterday. Any tips on how to clean this?

[Gimmie The Loot]

Went over to dad's for some grill time and he wanted to see if there was any treasure in the yard. He has lived there about 20 years but it was built in the 40's. Found some wheaties and clad but no silver... oh well. Last target was this square Illinois Dept of Finance token. I thought it was a scrap piece of metal at first until I saw the raised edges.

Anyone know what this is made out of and how I can go about cleaning it? I think it may be aluminum.. which isn't supposed to corrode right?

Thanks for any tips.

[idahotokens]

Yes it is aluminum and that material certainly does corrode, especially under certain ground conditions. Personally, I'd leave it like it is rather than trying to clean it. The "blows" where the internal aluminum has oxidized and expanded are impossible to do a lot with. If you have your heart set on a nice looking one, they show up online very often, usually for only a few bux shipped.
John in ID