Some of the country's lowest-paid workers could lose almost a quarter of their weekly wages under changes quietly introduced by the Abbott government.

Thousands of workers will be hit by the changes, which will strip between $172 and $225 a week from the pockets of full-time contract cleaners who work in government buildings.

Red tape repeal: The government is looking to abolish the Commonwealth Cleaning Services Guidelines for cleaners employed on government contracts from July 1. Credit:Louise Kennerley

The changes are among the 9500 regulations to go under Prime Minister Tony Abbott's red tape ''repeal day'' on Wednesday.

Buried in more than 50,000 pages of regulations and acts of parliaments to be scrapped is the revelation the government will abolish the Commonwealth Cleaning Services Guidelines for cleaners employed on government contracts from July 1.