Can I flush out an aluminum radiator with vinegar or some other chemical?

Just use thermocure, it's really amazing. It says to drive with it in and use for several days.

How long does blue devil say to leave it in?

I doubt 10 minutes of vinegar will hurt aluminum rad, but is it long enough to help anything?
I will certainly try the Thermocure. When a fellow Mopar car guy says a product is amazing, I will try it. The Blue Devil saus to run it for ten minutes after reaching operating temperature.