The Janesville Fire Department is investigating the cause of a vehicle fire outside a business on the city’s west side.  Firefighters arrived about 10:00 p.m. Thursday in the 1600 block of West Court Street to find a car fully involved in flames just feet from a laundromat.  Officials say no one was hurt, and the fire did not spread to a building.  A preliminary investigation suggests the cause may have been improper use of smoking materials.