Starting fluid by far cuts Way better then anything else. There is no comparison. Just finish off with some compressed air... Might not wanna smoke while your doing it though.

Brake Clean and air, as previously mentioned.

Wow did I get some junk out of one set of these lines! Who would have thought that sitting in my shop for a year would accumulate so much moisture???

Anyway, used carb cleaner and starting fluid to start, then brake cleaner, and compressed air. Stuck my scope in them to take a look and they seem pretty clean to me!