Yes, we had mice getting into our plastic bins. I can see it happening in the shaving too...they would love to nest in that.
Maybe you can cover the cans when outside, with a tarp? Big black trash bag that has been cut open to fit? Something that will cover it pretty good. Mine aren't out, but I wonder if that would be a problem. People used to use those to take their trash out. That's what we used..you youngins! And yes, I remember them getting rusty on the outside. If they get old, they rust through. That would take a while though.
Maybe you can cover the cans when outside, with a tarp? Big black trash bag that has been cut open to fit? Something that will cover it pretty good. Mine aren't out, but I wonder if that would be a problem. People used to use those to take their trash out. That's what we used..you youngins! And yes, I remember them getting rusty on the outside. If they get old, they rust through. That would take a while though.