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Cats are 100% effective but it's not a nice way to go for a mouse...
Best trapping method is to create a tunnel or corridor with two traps in the middle, facing each other with no space around the sides, so that in order to get to the food, the mouse has to pass over at least one trap.
Usually both traps go off and you get a trap-mouse-trap chain... Sounds a bit like something out of Saw IV but it's quick and works.
Placement is key, go for the edge of the room as close to the skirting board as possible.
+1 for peanut butter/nutella combo.
anyone got a good mousing cat i can borrow for a week
preferably pre starved so it can get straight on with the job