That is good to hear, I was not sure on that. I was pretty sure it would not "Flux" out but not sure on the separation and then be pulled out with the flux. Do you have any info on whether the same is true if using real flux like the stuff you get from Frankford?
https://www.amazon.com/Frankford-Ars.../dp/B0063GSOK8
I have heard this will remove everything but the base metals under the right conditions. I use it once when doing me WW's but my temps never go above 750. After that initial flux with the Franford stuff I just use wax. Actually I just started trying wax before pulling out the clips and that has made a world of difference in how much easier it is to get the clips out without all the dross attached to them. If you have not tried it I suggest you at least try it once or twice.