If you are using copper, why not just solder the joints?
As far as th left over copper pieces, I used hot water with a lot of pressure. Also, After I soldered evrything together, I let my manifold sit in a Bleach/Water solution for a couple of hours, then thoroughly rinse. Good luck and let us know how it comes out. Pics would be great!
You Can Give A Man A Fish and Feed Him For a Day, or You Can Teach Him To Fly Fish And Spoil Him For Life
On Deck MaiBock Helles,
Primary Simcoe Sevada 21, Bee Cave Kolsch 9,
American Amber Ale,
Kegged FrankenBrau 2013,
On Tap Robust Porter