HOLY Trinity was yesterday covered in fine white powder after vandals sprayed the church interior with a fire extinguisher.
The incident occurred sometime between noon and 2pm.
The contents of the 10kg extinguisher covered most surface areas in the church reaching up into the rafters in some cases.
The mess was found by one of the church's volunteer cleaners.
Holy Trinity Reverend Cannon Frank Hetherington yesterday said the clean-up would take four people at least two days.
"It's an act as mindless as that empty fire extinguisher,” he said.
The church, on the corner of Byng and Anson streets, is open to the public in daylight hours.
The church will be cleaned in time for weekend services and luckily there were no other services booked in the meantime.
Rev Hetherington said the church had been the target of vandalism in the past but again the motivation was unclear.
"Why? We don't' know,” he said.
Orange Police said there was little chance of lifting fingerprints from the extinguisher due to the dust and because the extinguisher was in a public place there were numerous fingerprints obscuring evidence.
Constable David Penny said people who might have seen anyone suspicious leaving the church yesterday afternoon should contact Orange Police on 6361 5499.