Just wanted to share a quick tip. I just finished transferring a Munich dark lager to secondary which I cleaned and sanitized with starsan (greatest product ever!) everything went well and it's siting happily in a dark room doing its thing. I was cleaning my primary as I had a huge blow off. I was washing the lid and was just about to put it away the. I remembered that the pressure was so big in the pail that Co2 was escaping from under the lid. I thought to myself I wonder if any crud got under the seal. I pulled it out and sure enough there was a ton of crap in there. I cleaned it out and decided to make this a standard part of my clean up. I would have never thought to check there had I not had the blow off. So I guess the moral is no matter how good you think you clean something always double check yourself. Hope this helps others in their adventures in home brewing.