Schlenkerla said:Definately Rinse!
Here is the manufacturer's website.
http://www.ecologiccleansers.com/homebrew.html
Your LHBS must have confused it with One-Step. Like Pfunky said, both are made by the same people.
I would tell the shop keeper that he is wrong too. Its a good way to ruin a batch of beer and an easy way to turn off a newby to the hobby.
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