Share 'need gardening help--mice and rats into the greens in my greenhouse. YUCK.'

if anyone has any advice, I'd GREATLY appreciate it. im having problems with losing my greens in my greenhouse to rats and mice. i thought the droppings were just from slugs, as they were on the veins/base of the plants (swiss chard is what theyre really after at the moment), but today i saw droppings that are definitely rat/mouse size. they are decimating my chard in the greenhouse, and have p...