Glue boards are an effective way to rid your home of mice because they are convenient to use, highly effective and can be placed virtually anywhere. In addition, they require no maintenance besides checking them regularly.
Cut pieces of the cardboard with scissors into a size that makes sense considering where you'll be placing them. Mice like to run along walls and are usually attracted to water sources -- including the water heater, plumbing areas, dishwashers and washing machines. Make sure that your cutouts will fit the space before applying glue.
Before cutting, consider tripling the size of the piece of cardboard so that, when folded into thirds, the two halves can be taped together on top, forming a cover that will keep it things that shouldn't from sticking to the glue -- pets, dryer lint, etc. It will also block your view of a trapped mouse.
Remove personal items such as rings or a watch and roll up your sleeves before opening the glue. Rub a small amount of liquid detergent on your hands and the plastic knife to keep them from getting sticky.
Scoop out the glue using the knife and apply it from the center of the cardboard strip, spreading toward the edges. Cover each board with a layer of glue that's about 1/8 - ¼ inch thick, leaving ½ to 1 inch around the edges to ensure you can handle it (if you haven't made a triangular-shaped top).
Reseal the glue can, throw away the knife and place the traps where mice frequent. You can enhance the effectiveness of glue boards by placing bait such as peanuts or sunflower seeds in them.