Parliament's cleaners are to stage fresh strikes in a pay dispute when MPs return from their recess.
The cleaners are threatening to strike all through the autumn
The Transport and General Workers Union (TGWU) wants their "poverty" pay rates of £5 an hour to be raised to £6.70.
They staged the first-ever strike at Parliament in the summer when MPs broke up for their break.
The TGWU said MPs and House of Lords members will have to clean their own offices and toilets when the series of strikes begin on 10 October.
The union will also be publishing a "list of shame" naming MPs and Lords who were not supporting the cleaners' case.
Deputy general secretary of the union Jack Dromey said it was an "absolute scandal" that Parliament allowed workers to be employed on such poor pay rates, with no pensions or holiday rights.
He said: "Parliament should be ashamed of itself. We will not allow them to employ a forgotten army of twilight workers.
"If the door to a settlement remains shut, industrial action will resume from 10 October and for as long as is necessary throughout autumn.
"The cleaners will strike and strike again."
The cleaners will be lobbying all the major party political conferences in the next month.