Firefighters have loaned equipment from Mobil refineries to try and extinguish a chemical-fuelled warehouse fire in Melbourne's inner west, which has burnt for more than four days.
MFB incident controller Peter Thomas on Monday said because the Tottenham site is so big, crews needed the equipment to spray water further to extinguish the remaining hotspots.
"Because it's such a large building, our elevated platforms and monitors just can't quite reach right into the centre of that to get enough water in to fully extinguish the fire," he told ABC radio.
"It's been knocked right down but the fire continues to burn under the surface so the task is to get water right to the seat of those hotspots."
Firefighters will have to try and drown the fire after the old asbestos roof collapsed during the blaze, on top of sea containers and scores of drums and cylinders of chemicals inside.
"It's deep seated so the more water we put on, the more chance we'll get the water into the right spots," Mr Thomas said.
"Hopefully it trickles down and extinguishes. In saying that, there's only small amounts of smoke emanating so that's why we're hopeful we'll be able to achieve it today."
Much of Melbourne was under thick plumes of toxic smoke on Thursday after a fire began at the asbestos-ridden West Footscray factory, which housed aerosol cans and 44-gallon drums containing grease, oil and acetone residues.
It took 17 hours to bring under control and needed more than 140 firefighters.
Police are now investigating and it has since been revealed the owner of the building was raided recently by the tax office.
Documents obtained by AAP show the Tottenham factory is owned by Danbol Pty Ltd, whose sole director is Christopher James Baldwin, 74, of Mooroopna, near Shepparton.
Earlier this month, Mr Baldwin's accounting firm was reportedly targeted in Australian Tax Office raids.
Hells Angel Reginald George Roberts, 65, of Haberfield, SA, is listed as a previous board member of Danbol.
In April, he was charged over South Australia's largest ice seizure, worth $270 million.
The site had also been referred to a multi-government agency taskforce assigned with inspecting resource recovery facilities across Victoria.
That taskforce was launched after the Coolaroo recycling plant fire in July 2017 and the MFB had identified the Tottenham site for inspection, Mr Thomas said.
More than 800 sites had been identified for the taskforce to examine.
