hi, my piggies are on Aubiose hemp and hay. They tend to sit on the hay so i lift it out and shake droppings/pick out wet bits into a bucket. then i pick through the hemp with a spade/my hand to pick out wet/dirty bits - you get to know where they will be! the hay can then be topped up and returned (they have eating hay in their racks). I do this once or twice every day.