PBA: The Gilyon Maharsha YD 122 on Shach 4 writes that knives are used frequently and stam keilim einam bnei yoman does not apply to them. Additionally, Darkei Teshuva 122:18 quotes the VaYeishev Moshe that a type of pot that is usually used every day at least once is a vadai not safek, and assumed ben yomo.
I have long heard, but not seen inside a sefer, that in a commercial establishment stam keilim does not apply. Based on these sources and the logic of the sfek sfeika, it would seem to be a very reasonable statement.