The Blues mentor also likened his 2020 outfit to the classes of 1994 and 2005 - two times NSW have won at Lang Park to clinch a State of Origin series win.

While Cleary's kicking game was especially on song, the Maroons lost star Cameron Munster in just the third minute after he slammed his head into the Sydney Olympic Stadium turf.

It meant Queensland were without one of their key playmakers for most of the Blues' 34-10 victory on Wednesday night.

But Maroons coach Wayne Bennett expected Munster would be right for the decider at Lang Park next week.

Back to Cleary.

He repeatedly kicked early to nullify the Maroons' pressure that suffocated him in game one.

Not only was it early, but it was pinpoint accurate as he repeatedly turned Queensland around and put them on the back foot.

The Maroons struggled to get any go-forward as a result and the scoreboard reflected that.

Fittler was especially impressed given Cleary's first kick was caught in-goal by Munster - ironically it was the kick where the Maroons five-eighth was concussed and didn't return from.

But Fittler wasn't allowing his team to rest on their laurels.

"He's got a really good character and he's a tough kid. He just handled it, which was great," he said of Cleary.

"It's great for the future of Penrith and the Blues.

"But we won the game we were most probably expected to win in front of our own crowd, Cameron Munster got hurt early, a lot of things went right for us.

"It was great to give us an opportunity to go and win it at [Lang Park], but there's always a reaction in State of Origin and we just need to make sure the players are aware we just need to get ready again.

"It's got to be the same if not better."

That better involves getting the better of a hostile Queensland crowd next Wednesday.

The last time the Blues won the series in Brisbane was in 2005, when they also overcame a 1-0 deficit to triumph 32-10 in the decider at Lang Park.

It was a similar story when the Blues triumphed 27-12 in game three in '94.

Fittler played in that game alongside greats like Ricky Stuart, Laurie Daley and Glenn Lazarus, while 15 years ago there was Andrew Johns and Danny Buderus - with Stuart as coach.

"It's a great challenge. They like a challenge," Fittler said.

"We had to go there and win in '94 and 2005 so we're comparing ourselves to those two teams, which are great teams."

Bennett said he didn't see the incident that led to Munster's concussion well enough to have an opinion about whether he was tackled in the air before slamming his head on the ground.

But he was confident Munster's medical history would help him recover in time to run out in the No.6 jersey for Origin III.

"He's fine. I would say that [he'll be right to play]. All indications are he's fine. He has no history of head knocks as well so it all helps," Bennett said.

"I'm not sure about that. I didn't see it well enough.

"It looked like he hit his own head going down onto the ground, but I haven't seen the vision well enough to make a definitive point of view on that."

While Fittler was confident his team could put themselves on a par with great Blues sides of the past - and get his first Origin win in Queensland as a coach - Bennett was also confident the Maroons could turn around their hefty loss and get back to the form they showed to win the opener in Adelaide last week.

"We lost it in seven days so I reckon we can get it back," Bennett said.

"I don't think they would've lost a lot of confidence in themselves, I don't think that would've been a [problem]. They all know they can play better than they played tonight."