Almost thirty people are facing fines of more than £2,500 for fly-posting following an initiative by West Midlands Police and Birmingham City Council.
Operation Ibiza is part of a Government campaign to clamp down on illegal advertising offences.
An exercise during the Bank Holiday weekend caught several people attaching placards to street furniture in Birmingham City Centre.
The problem has increased in recent years, with numerous boards advertising club nights and factory sales frequently being attached to lampposts and railings.
"This is not just about tackling anti-social behaviour, it is about dealing with people whose actions are severely disadvantaging law-abiding businesses", said Coun Neil Eustace, chair of the public protection committee.
"Placarding or 'boarding' as it is known in the trade, is a very cheap form of advertising for clubs and businesses", he added.
"However it is the council tax payers who end up paying the clearance cost of removing these illegal advertisements estimated to be in excess of £500,00 per year."
Mohammed Sajid Arif (27) and Sihain Mohammed (38) both Moseley, are among those prosecuted for the offence.
The men pleaded guilty to offences of 'boarding' for a pine furniture company and were fined £3,000 and ordered to pay £150 in costs.