DANDENONG South residents were advised to close their windows as smoke billowed from a suspicious factory fire on Sunday 5 June.
Firefighters were called to Allcar Towing about 6.20am and found the 30-by-20 metre Kirkham Road building and the 10 cars inside fully alight.
Seven trucks, including the Hallam and Dandenong brigades, attended and brought the fire under control at 6.52am.
The CFA issued an advice warning for nearby residents to close their windows due to smoke.
Greater Dandenong CIU is investigating the cause of the fire.