Never used it. If you get a chance and find some .... Rusty Duck Black Off Black Powder Cleaning Solvent is what I found and use. It really cuts the fowling out and takes the junk from the barrel. I like to put that in the barrel and then brass bore brush the barrel. A few more solvent patches and the barrel will just shine.

After that I run a coat of oil down the bore and loading is a breese....