Originally Posted by bsyoung
That's a good question...ill be waiting for an answer from someone....
You'd be better off making an extract to add to seconday. Put the zest into a jar, cover it with vodka and let it sit for a week or so. Shake it every once in a while. Strain it with a coffee filter into secondary. You'll get all the taste and none of the infection potential...
As for the earlier comment "wash them well", if you're pitching into the boil for 10 mins, you don't need to worry about contamination. The boil will kill anything that may be on the peel. I would rinse them, you don't want wax or pesticides in your beer.