Australian Greens Leader Bob Brown has moved in the Senate for the establishment of a Truth in Political Advertising Unit before the federal election due later this year.

His motion will be voted on tomorrow.

Senator Brown condemned the trend to misleading attack advertisements.

Citing Liberal advertisements devised in conjunction with the Exclusive Brethren sect in Tasmania in 2006 and current Labor advertisements attacking the Greens, Senator Brown called on both parties to confront their backroom operators and clean out the dirt campaign eroding standards and misleading voters.

Senator Brown also said Labor advertisements attacking the South Australian Liberal Leader Isobel Redmond on drugs and prison policy breach reasonable standards of decency in politics.