TORONTO -- It's the last weekend of campaigning before voters go to the polls on Thursday.

All three main party leaders will be hitting the campaign trail today.

Premier Kathleen Wynne has events scheduled in Waterdown, Niagara Falls and Hamilton, while PC Leader Tim Hudak will be in Mississauga, Wilmot Township, and Strathroy.

NDP Leader Andrea Horwath starts the day in Toronto, then campaigns in Hamilton, Guelph and London.

The gas plants scandal that followed the 2011 election was a hot topic on the campaign trail yesterday.

Provincial police investigating the alleged destruction of government documents related to the cancellation of two gas plants served the legislative assembly with a court order for logs showing who had entered the legislature.

It was under former premier Dalton McGuinty that the Liberal government cancelled the Oakville and Mississauga plants -- a political decision that cost taxpayers an estimated $1.1 billion.

Wynne pleaded with voters to judge her on her record and campaign platform, and consider how she has handled the scandal.

The Progressive Conservatives seized on the police action to demand Wynne make all relevant documents public immediately.

Hudak said voters aren't going to stand for a coverup -- "they want answers."

The New Democrats called the court order another reminder of why the province needs a change of government.

Horwath said people are tired of the stench of corruption in Ontario and they want it cleaned up, declaring the June 12 election "a referendum on corruption."