Our modern, dust controlled vacuum sweepers can keep virtually any size parking lot clean of sand, salt, litter and debris. Reliable Sweep has been maintaining parking lots in Green Bay and the Fox Cities for more than 20 years. We have built a reputation on service, providing our customers with a quick, thorough job. Our list of satisfied customers includes a number of names you'd recognize.. Malls/ Shopping Centers. Apartment Complexes. Businesses. Parking Ramps. Warehouse.