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Planetocean I think has the best cup.
I used to use a ceramic bowl, large mug, and now a bowl of steel for $ 1

Metal bowl with easy warm hair dryer, then take the foam

True. There is no difference, only in price.
Important that the foam cup to hold comfortably, conveniently mixed and must keep warm. Top heat keeps vessel of clay.

Shaving foam to do in a bowl,...