An anonymous building worker has sparked outrage by placing a sign on the men's toilet of a Sydney city office block in an attempt to ban Muslims from washing their feet in the sink before their daily prayers.

The sign, which has a cartoon of a man with one of his feet in a sink and surrounded by a circle with a slash through it, was placed on the door of the men's toilet of an office block on Pitt Street, in Sydney's business district.

The sign is believed to have gone up on Wednesday, just days after a building worker queried one of the shop workers who use the toilet.

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Days after a building worker questioned Muslim store clerk Mohammad Faisal about washing his feet in the men's toilet at a Sydney officer building, this cartoon was stuck on the men's room door, depicting a cartoon man washing his feet in the sink with a 'banned' slash through the image

The sign is stuck to the door of the men's toilet in the CBD office block which is used my Muslim workers to wash their feet in the required ablution before their five daily prayers to Allah, a practice which apparently offended the man who put up the cartoon

Mohammad Faisal demonstrates how he washes his feet in the toilet basin

Mohammad Faisal, a business student who works 20 hours a week in the convenience store, told Daily Mail Australia that Dhuhr and Asr - two of the five daily prayers required by his religion - fall during his 10am to 4pm shift at the shop.

The 26-year-old Pakistan native, who is studying in Australia to fulfill his late mother's dream, said earlier this week he went as usual to the first floor men's room to do his pre-prayer ablutions prior to Dhuhr, the prayer just before midday which currently falls at 11.52am.

He said that, as was the custom, he washed his hands, his mouth, his head and his neck, as well as his arms, and then placed his feet one at a time into one of the men's rooms' two sinks.

Mohammad Faisal (pictured) was just doing his customary pre-prayer ablution washing his feet in the men's room sink when a man asked him what he was doing, and later the sign appeared.

Mohammad Faisal (pictured) washing his feet in the sink of the men's toilet as he does before the two payer sessions which fall during his work hours three days a week when the business student earns money for fund his studies in Australia

'I have done it when you bring water from the sink down to the ground to wash your feet, but it makes too much of a mess, it is not clean and it makes the floor slippery and dangerous,' he said.

He was washing his feet when a man he didn't know entered the men's room and asked him what he was doing with his foot in the sink.

'He said "what are you doing" and said "I just washed my feet" and he said "okay" and left.

'Then yesterday this sign went up. I don't know, maybe he put it up because he didn't like it. I don't like to blame anyone.

The pre prayer washing ritual entails cleansing hands, arms, face and neck, as demonstrated by Mohammad Faisal at the Sydney office building where the cartoon was posted

Mr faisal said 'At first when I saw the sign I smiled, but then I thought why did he put up this sign, is it meant to mean we are not to do our ablution'

'At first when I saw the sign I smiled, but then I thought why did he put up this sign, is it meant to mean we are not to do our ablution.

'But I must do ablution or I cannot pray. It's about being respectful to my religion.'

Mohammad's boss, contacted his boss who alerted Muslim community advocate Zaky Mallah, outraged at the apparent attempt allegedly by the one of the building's workers to prevent working Muslims from using the sink for their ablutions.

'This country has freedom of speech but that cartoon is racist and it is taking freedom of expression too far,' Mr Mallah said.

'When was it a crime to wash up in a men's room for Muslim prayers? It happens everywhere around the world.

Mr Faisal pointed ot the floor, saying 'I have done it when you bring water from the sink down to the ground to wash your feet, but it makes too much of a mess, it is not clean and it makes the floor slippery and dangerous'

Mohammad Faisal in the men's toilet where the sign is still on the door 'banning' Islamic pre prayer ablutions

'When Muslims want to perform their five daily prayers they have to go and wash up.

'And it would be happening around Australia every day for Muslim men, and women too

'Possibly this man [who put up the cartoon] thought he was being funny, but this is a ridiculous joke and it is intimidating people going about daily business.

Mohammad Faisal, who came to Australia for the first time seven months ago said he found the country 'very friendly' and the people 'very good' and that it had been his mother, Zohra's dream before she died six years ago of kidney failure back in his home in the Punjab state that he study at an overseas university.

'I am the only son and that was her dream,' he said. 'I chose Australia because my brother-in-law was studying here and he told me Australia is very good and the people are friendly.'

Mohammad moved in with his brother-in-law, who has just finished a university degree, to a house at Lidcombe in Sydney's west and embarked on his three year Bachelor of Business degree at Group Colleges Australia in inner city Redfern.

He works three days a week at the convenience store and spend the rest of his week studying, or playing the occasional game of cricket with friends. Her plays at provincial level back in Pakistan, as an all rounder and fast bowler.

Mr Faisal plans to become an accountant and run a poultry export business when he returns to Pakistan.

At the convenience store yesterday where he works with another Muslim man, he politely served customers and then - despite the sign - spent a few minutes washing in the men's room.

Then, as it came time for the Asr prayer, which falls at 2.48pm' he headed out the back of the store to pray on a prayer rug.

Mr Faisal said that like most practising Muslims he didn't feel right if he missed out on any of his five daily prayers and that without ablution - called 'wudu' - he could not present himself before Allah to pray.

'If you can't ablute, you can't pray,' he said.

Paul Culbi from Jamesons, the strata managers of the building, said the cartoon was 'racist, defamatory and a breach of owner corporation guidelines'.

'I would like to say that this racist item is against guidelines and I will be making a report to the owners,' he said.

'Apart from being a breach of guidelines to place anything up like that without owners' permission, it is racist.