The Greens have vowed to clean up politics and make political donations more transparent if they win the balance of power in Victoria's upper house.

Victorian Greens leader Greg Barber says it's time to get decision-making back on the level of integrity.

"We need to clean up politics and make sure the decisions are being made for the common good and not in the interests of those people that have poured money into the campaign war chests of Labor and Liberal," Mr Barber told reporters on Friday.

From the steps of the Victorian parliament, Mr Barber said the Greens are confident they will secure upper house seats on Saturday.

"We're looking really good and all year voters have been telling us they don't want a parliament where one party controls both houses," he said

The party said they wouldn't work with the coalition in the upper house and criticised their environmental record.

"We have ruled out working with the Napthine government as they have been a rabidly anti-environment government for the last four years."

The Greens want assurances from the major parties that forests east of Melbourne will be protected - something that neither major party has put forward.

But the Greens' biggest message before the election was a call for immediate donation disclosure.

"Time and again, people ask why certain decisions are being made seemingly for the benefit of property developers, of the casino and companies with an insatiable appetite for road building," Mr Barber said.

Victoria currently has no donation laws applying at the state jurisdiction with reports released by the Australian Electoral Commission more than 12 months after an election.

"Well, in this election, your choice has been between the Palmer Party and the two Packer parties, and all roads lead to the casino," Mr Barber said.