Right on the wall behind G in the Gadget Room.
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There are two missions like that. One is The Secret of the Fur Mission (mission 5) and the other is Mysterious Tremors (mission 8).
it realy dont do nothing. in missions, the cream soda may have an effect that will help you continue your mission eg: mysterious tremors.
In the corner of the Gadget Room, there is a shelving unit and the large propeller hat is on the left side of the central shelf.
Go to the gadget room and take the hammer on the wall
In the ice cave