I'm gonna move into all grain brewing and am currently working on making my own mash tun. I want to put some wire inside of the wash hose to keep it from getting squashed by the grains. The only wire I have though is aluminum wire. I know pots and such are made of aluminum but when I'm working with this wire some residue comes off and turns my hands grey. I'm wondering if it would be safe to use if I just clean the wire. Any ideas?