If you put peanut butter or cheese in the trap you are going to catch a male mouse who is out hunting for food. You can kill males by the dozens, but if you leave one female alive - you are going to continue to have a mouse problem.
If you use cotton or lint you are going to catch a pregnant female who is out looking for nesting material to have her litter in.
By killing the pregnant females - you will stop the infestation at its source. Kill all the females and the mice will die out after a while. Kill the males and you will have mice forever.
Made perfect sense to me.
Better living through science!
The mice have artificial insemination?
Great idea! I'll have to give it a try.
Learn something new every day!
Carolyn