What Should You Not Put In A Kitchen Compost Bin?

What Should You Not Put In A Kitchen Compost Bin? Fat, grease, or oils of any kind. Grains of any kind, cooked or uncooked. Large, protein-rich seeds like those winter squash. Meat or meat waste products, including fish and poultry, bones, fat, gristle, or skin. Which item can you not put in a compost bin?