Murderer!
Works really well, when my mums house was unoccupied for a few months we spotted mouse droppings. Put down a few small squares of white paper with some of this on each one and took photographs. Went back a few days later and we could see that a lot had been taken. Over the space of the next couple of weeks, the amount taken reduced until there was no more gone and no more droppings.
There so much movement going on in the gable its like a rave up there
Works really well, when my mums house was unoccupied for a few months we spotted mouse droppings. Put down a few small squares of white paper with some of this on each one and took photographs. Went back a few days later and we could see that a lot had been taken. Over the space of the next couple of weeks, the amount taken reduced until there was no more gone and no more droppings.