The group, along with up to 30 business owners, met with gardaí last year but, after seeing prostitutes return to the streets, has decided prayer might be one answer to the problem.
“We’re praying for the girls. A lot of them are poor, from Eastern Europe and have come here expecting jobs and a better life,” said one man, who regularly prays outside the premises.
“We’re not against the women per se — they are somebody’s children.
“It’s also not good for business here. We’ll continue it because of the power of the Rosary and the power of the prayer.”
Women praying with him often approach the sex workers to give them holy medals, he said.
While he said he has not seen the women in recent days, he does not believe “our prayers have been answered yet”.
The Rosary will continue on unspecified week nights at about 5.30pm and at the weekend at 8pm, he said.
Following a number of high-profile arrests, gardaí in Limerick City say they are continuing efforts to tackle prostitution in the city.
Operation Freewheel, which took place in late 2011, saw nearly 30 men detained and charged with soliciting or importuning for the purposes of prostitution.
The majority pleaded guilty to the offence, made a donation of €470 to a nominated charity, and had their charges struck out.