Merseyside Fire and Rescue says the incident has been divided into sections in order to deal with the fire.
Part of the roof of the building has collapsed and a large number of tyres are involved in the fire.
The nearby Pilkington's factory has been evacuated but emergency services say it is not currently affected by the fire.
Residents are being advised to keep doors and windows shut until further notice.
More top news
Four University of Manchester students have been jailed after their "dark web" drugs trafficking operation was exposed by the FBI.
Thousands of motorists may get bus lane fines repaid to them after a council admitted issuing 23,500 tickets too late.
The Isle of Man has today approved the introduction of a new Manx state pension from April 2019.