Water rinse avoiding touching the parts. Negative lead to lead plate. Use the aluminum wire. A good contact is the secret to success. Immerse in acid.
Gas bubbles evolving from the lead plate proves that anodizing is occurring.
Leave parts in the anodize process 25 to 30 minutes. Boil parts for 10 minutes in tap water to seal the anodizing. The only caution note is to be careful with the acid. It is not a strong acid, but acid is acid and can burn, therefore use personal protection of skin and clothing and in event of an acid spill, wash thoroughly in baking soda and water. He switched to platinum plugs and reports that his engine is now pure pleasure to start, idles smoother and runs better.