Just call up and ask them if they'd be willing to give you advice on your idea/company. Don't sell them, just call and ask what they think of your company.

If you're afraid of burning those customers / just call ones in another city or country.

You could also call folks on Clarity to get feedback on your idea and ask the potential customers how they want to be approached.

That being said, the future of sales is based in inbound marketing - cold calling (failing for dollars) is old school and annoying.