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

I will try the Thermocure, but it looks like I'll have to wait until I get the motor back in the car and running.
I watched the video on Thermocure before I bought it. They also showed how you could drain the radiator into a bucket and reuse that water mixed with thermocure in another engine as well, or use the drain water to clean parts.