Cleaners on the London Underground celebrated last week after it was confirmed that they will all be paid the London Living Wage of £7.85.
The victory follows a long campaign by cleaners in the RMT union, which included strikes in 2008.
Tube Lines cleaners working for ISS have now joined their colleagues on a decent rate of pay.
Clara Osagiede, cleaning grade secretary for the RMT, said, “This is a very significant breakthrough and the union should use it as a springboard to bring the cleaners back in-house.
“Tube Lines has gone bust and all the workers are being taken into Transport for London, except for the cleaners.
“Even though we have won the London Living Wage, the contractors are continuing to victimise cleaners.”