Which is weird but they do it. Folks throw trash on the ground and it just blows around until it gets caught in a corner of your parking lot, your landscaping and front entrance. Now it looks like it is your garbage. Customers do not like frequenting a business that has trash all over it. You will lose paying customers.
It's not your fault but your property now has a trash problem and customers are not impressed. It is important to keep your lot and grounds free from stuff like trash, cigs, plastic cups, lids and broken glass.
Your appearance matters and the outside of your lot and grounds are what people are going to judge you by. Keep your property clean and customers will keep coming back.