Soap, and Dairy products are the two no-no's in glassware you want to pour
beer in. Both are bad for the head - though, it typically only noticeably
affects crap mass produced lagers like bud and coors light - it's hard enough
pouring those two with a decent head in the first place. Many beer
distributors really advocate the four sink, manual washing system to help with
the soap issue.
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Cheers! - Josh @ BarSim
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http://www.barsim.com
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BarSim (tm) - The Ultimate Bartending Simulation
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All About Bartending - The Blog http://allaboutbartending.blogspot.com/