I used a Cold Blue kit from Birchwood Casey. It comes with a Degreaser/Cleaner that works well, the blue agent, and a couple little accessories and was less than $20 and the amount included can do several barrels. Not really hard persay, but it is kinda time consuming.
A good plan executed today is better than a perfect plan executed at some indefinite point in the future.
- General George Patton Jr