Cleaning an aluminum token

[cybball]

Had an awesome day! My sister let me hunt her 1921 home and I found my first wheat penny. Actually, found 3 of them. All are 1944. I also found what I believe is an aluminum tolken. It's got a scalloped edge. It says R.R. Roberts and appears to be a cigar token. My question is: How do I clean the corrosion off of it without messing it up. I'm positive it is aluminum. I used a toothbrush, which worked for most of it, but there is some really hard corrosion that just doesn't seem to want to come off.
Any suggestions Soak it in something?

 

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[cybball]

Here are both sides .

 

[wvwildman]

SOS pad works great

 

[SusanMN]

I just soaked one in lemon juice and most of the crud came off.

 

[cybball]

After more scrubbing it appears to be a 5 cent token for Sight Draft Cigars . Anyone ever heard of that?

 

[SusanMN]

There is a token forum. You might want to ask there.

 

[cybball]

Thanks