I started out like this in my younger years and I had no idea what I was doing. Still don't. The most I ever made in a day was when some guy stopped his car and handed me a $10 bill and thanked me for cleaning up the neighborhood. A week later I stopped collect roadside cans after I saw a elderly couple picking cans roadside. I figured that someone needs aluminum can money more than me.
The best spots to pick cans are freeway exits and entrances. Everyone is pitching their trash there. Beer cans, pop cans, energy drinks are what I always found.
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