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by nordsieck 2881 days ago
> how dirty is too dirty to recycle in the case of aluminum

I doubt they care about anything on the aluminum at all. If you watch videos of people melting down soda cans into aluminum ingots [0], there is a lot of dross or non-aluminum material that needs to be removed. Since there is already a process in place to eliminate non-aluminum material, I wouldn't worry about a bit of food.

[0] https://www.youtube.com/watch?v=ldURYZyRYMA