I have had this grill for 4 months now...there is a lake to my backyard...so they are coming from near there. When I cleaned the grill for the first time.....it attracted these ****ers... I find rat turds around the grill when I go to use it...and I can tell they have gotten into the grill as well. They get in under a cover I put on the gas grill to protect it. I DO NOT want to use traps.... any suggestions?