Approaching local businesses to create scrap leads?

Hi fellow Scrappers,

Recently I have went into business with a friend of mine collecting scrap and selling it. Although so far we have mainly done call in pickups for random people from craigslist and our Facebook post.

Anyways, this past week I was able to obtain a deal with a local collision repair shop to pick up their scrap fenders and other metal on a weekly to bi-weekly basis. I was able to make this connection through a family member that is friends with the owner. I am now looking to connect with more local businesses to create a network of pick-ups I can do on a regular basis. I plan to mainly stick with local small businesses because I feel that most "chain" businesses will not be able to help me ( If I'm wrong for believing this please let me know!)

So my question is, which businesses are good businesses to target? And how should I go about contacting them the first time?

I already have my eyes on a local home gutter business that I noticed has a pile of scrap from cutting gutters but I do not want to make the wrong first move contacting them. Any help is appreciated.