Nothing seems annoying, like finding mice droppings on your grill. Mice can invade your BBQ grill if left unused for a long time or when there are leftover foods on it. These creatures are not only irritating, but they carry diseases with them too. They have viruses and bacteria in their bodies, and their urine and droppings are hazardous to human health. Keeping them entirely away from your grill needs patience and time. A few preventive measures and some other methods are a sure way to keep them from hiding on the grill.