I keep finding them in my empty trash cans

I leave the trash cans in the house and it's been 40-50 degrees in the house during the day with the empty trash cans. I've had no issues until yesterday. I decided to move the trash cans in the garage and it's been 28-30 degrees in the garage. I came home last night and found 5-6 WCSB in the empty trash cans. If I had no reason to check them, they'll still be there. <br><br>I had a bigger issue this morning. I had baked some cookies and kept the dirty cookie sheets in the house and I had about 20 WCSB in the cookie sheets. <br><br>So, please check them even if you think it's cold.