Clive Palmer has sprayed the Liberal Party, describing a "murky world" of donations, improper behaviour, and reminiscing on a near-punch-up with Tony Abbott, as he prepares to depart Federal Parliament.

On the same day that Federal Cabinet secretary Arthur Sinodinos said he would fight for political donation reform if the Liberals are re-elected, Mr Palmer accused the party of being a "cesspool" of secrecy.

"It's a whole murky world, the Liberal party ... they don't publish accounts, they have no audited accounts, the accounts are not made available to members of the executive or senior donors to the party," he said.

"I was their biggest donor, I certainly declared all my donations but there's a whole heap of people that don't."

Mr Palmer said two former party treasurers, including Michael Yabsley, resigned because they were not allowed to see the party's accounts.

"Michael Yabsley resigned because they wouldn't tell him what money was in the bank, who donated it and what it was being used for," he said.

"At the time he was treasurer he told me that only Tony Abbott, Peta Credlin and her husband [Brian Loughnane] had access to the funds of the party and no one else knew what was happening."

Lateline contacted Mr Yabsley to confirm that statement, to which he responded: "I would say that's substantially right and it's something that caused a lot of grief in the party."

Palmer says Turnbull wanted to 'get' Conroy

Mr Palmer was once a life member of the Liberal Nationals, but fell out with the party in 2012, started the Palmer United Party, and narrowly won the seat of Fairfax at the 2013 election. He is not recontesting the seat.

He claimed that in 2014 when PUP held the balance of power in the Senate, Malcolm Turnbull, who was then the communications minister, offered him the role of joint chairman of the NBN committee because he wanted to "get" the shadow minister at the time, Stephen Conroy.

"Malcolm Turnbull said to me that he wanted to 'get' Conroy. He told me that he wanted me to remove him from the Senate committee because he wanted to hide, I believe the overrun of the NBN, of $15 billion," Mr Palmer told Lateline.

"[Mr Turnbull] said it to me directly, he said 'Clive, would you like to be the joint chairman of the NBN committee? I think that would be really good for you. It's a job that you can do because you've had experience in business. I've got this terrible problem of Stephen Conroy bringing down my CEO every Friday for questioning in the Senate.'

"I think the intention was that we wouldn't continue to investigate the NBN and hold it to account."

Lateline has contacted the Prime Minister's office for a response.

'Aggressive' clash with Abbott

Mr Palmer has also revealed more about his falling out with Tony Abbott in 2012, when he was still a member of the Liberal Party.

The disagreement took place over drinks in Melbourne, when the two clashed over resolutions to restrict lobbyists in the Liberal Party.

"I packed up my stuff and said to Tony Abbott that I had to leave to talk to some more important people than him and as I tried to leave the room he blocked my exit, gesturing with his hands in what I would say an aggressive manner, asking me to sit down and sort this out," he said.

"I decided I should leave, so I went to leave and he stood and blocked my way. I then reminded him that he was quite a capable boxing champion as a bantam weight when he was at university, whereas I was a heavyweight and he should step aside, and he did.

"Peta Credlin was sitting there gasping in the corner."