Thanks for the plug for my book.
I too watched the Alton Brown show you mentioned. Because he speaks in a precise and authoritative manner doesn't mean he actually knows what he is talking about.
I have made a few million pounds of sausage with natural casings and have never had any cleanliness issues. It is very hard for a small time used to buy synthetic casing in small quantities and they don't deliver the mouth feel and texture that natural casings do.
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