General Secretary Bob Crow said the damage was "shocking" and highlighted cuts to the service.
Mr Crow said the cleaners were working "in often appalling conditions with no proper recognition and reward whatsoever".
The RMT's general secretary Bob Crow said the cleaners were doing "some of the dirtiest jobs" on minimum pay.
Speaking for the RMT, Bob Crow said that too much focus had been given to station modernisation, rather than improving service quality.
Mr Crow said First's pay offer was "self-funding" - meaning it would have no cost impact on the company and ring-fences their profits.
"This is an astonishing instruction which shows that LU is prepared to risk serious injury and even lives to prevent service delays, " RMT general secretary Bob Crow said.
"Today's massive mandate for action by RMT members on First Devon and Cornwall buses reflects their anger at the failure to come up with a serious pay offer, " Mr Crow said.
"When you start making money rather than to try to complete the project, that's when, to me, it's going off in the wrong direction, " Big Crow said in the Voice of America interview.
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And RMT general secretary Bob Crow said train companies "with the collusion of the government, will be jacking up fares by up to 6% in the new year as they launch a full-frontal assault on passengers in the name of profit".
Shadow transport minister Theresa Villiers said Bob Crow was "trying to drag us back to the 70s and the dying days of the last Labour government".
Julian Crow, FGW regional manager, said the rise in passenger numbers was "great news".
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And Bob Crow, general secretary of the Rail, Maritime and Transport union, said he was "deeply concerned" that the privatisation may cost lives and risk workers' lives.
My interest was slightly aroused when she said the eye treatment is especially popular among men because they reduce crow's feet.
"This research gives the lie to the argument that bosses can't afford to contribute to decent pension schemes - they'd just prefer to keep them to themselves, " said the head of the Rail Maritime Transport Union (RMT), Bob Crow.
Marina manager Mike Harris said he had seen ducks nesting on boats but he had never seen a real crow's nest on a mast.
The JP Morgan analyst who said last week that MMR was worthless, as in worth zero, might be eating crow even faster than those with a different view had hoped.
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