I use mag wheel cleaner made for all types of wheels to clean brass parts in. Let them soak for a bit and they come looking new. Brake clean to dry if you want, but not really needed. Brake fluid is not all that touchy, just keep the water away from it. Most all solvents will dry out before you install the part. Be sure to check the internal flare like Alvin mentioned, over tightening can really cause havoc with them making it nearly impossible to seal new line to them.

1937 Chevrolet Inline-powered Streetrod