So what is the best way to clean out a new loop, and drain it. As you can see in the picture I do have a drain port to my pc. I was going to run a combination of distilled water and vinegar in it, based on suggestion from person at microcenter. On thng that I'm wondering is if there is an easy way to drain the whole loop afterwards. Because I'm pretty sure if I just opened the drain only a little bit of the loop would come out but the fluid stuck inside radiator and blocks would stay.