I clean EVERY day wipe work tops down twice a day after cooking so I know my kitchen. Today while wiping down I found around 15 small grey balls behind the utensil holder. What could they be? I called my partner to get them as I was scared they were eggs lol but he said they were more like polystyrene we looked at ceiling and walls no damage. They weren’t near a window so couldn’t have blown in...there was no droppings (mice) as I was worried maybe they were carrying them off somewhere I am baffled?!