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NEW ORLEANS The roof of the Louisiana Superdome is getting a cleaning, again.

With cleanings in 2009, 2010 and now in 2011, it has become a yearly occurrence since the roof was fixed after Hurricane Katrina.

Crews began work this week, giving the white top to one of the city's signature buildings a much needed scrubbing before the Saints game Sunday.

The dirty stains on the roof are actually mold. That mold attracts dirt and pollution, creating a 10-acre mess on top of the dome. And cleaning up the mess isn't cheap, costing approximately $90,000 per cleaning.

'It bothers me as much as it bothers the fans,' said Doug Thornton, a vice president for SMG, the group that manages the Superdome, when officials announced last week the roof would get cleaned again.

'Every day when I drive in and see the roof, I ask the question, 'Why is it getting so dirty and why is it happening so rapidly?'

To combat the reoccurring problem, the Superdome roof is expected to be painted in the offseason and a special mold and mildew inhibitor will be added to the paint to help keep roof from looking dirty in the future.

Last week, Thornton promised to have the roof will be clean again before the Saints home-opener against the Chicago Bears Sunday.

'It's been in the plans now for several weeks,' said Thornton. 'We had to schedule it with the contractor to get up there at a time when the Saints were away.'

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