K.K.
My lactation consultant recommended the supplement Lecithin to me, to prevent recurrent clogged ducts. I've had a clogged nipple pore twice in one breast (who knew such a thing could even happen right??) and taking this has helped to clear it and prevent it from happening again. You can find additional information about the supplement and dosing here in the handout about clogged ducts and mastitis. My lactation consultant said this website (and the Dr. who wrote the articles) is one of the best resources for breastfedding support/issues. Good luck!!
http://www.breastfeedingonline.com/newman.shtml