The 30-year-old left-hander's unbeaten 89 off 52 balls, which rescued Australia from another poor start in the second of the three-match series, ended up being the key in his side's seven-run victory on Friday which handed them an unassailable 2-0 lead.
It came after Renshaw had been going through a torrid time with the bat, having scraped together just 24 runs in his previous five innings in Pakistan and Bangladesh, and Australia's three-format batter was not about to hide how key the career-best T20 knock was in boosting his confidence again.
"I think there's always those doubts around whether you're good enough, especially when you're in and out of formats and in and out of teams, so it was nice to realise that I'm good enough at this format," beamed Renshaw, who had scored 4, 2, 0, 0 and 18 in his previous innings on tour.
"Obviously my international career has been a bit strange around different formats, but I think just being able to be comfortable in my skin, today was a really important innings for me.
"It came just after a run of low scores, just remembering why I wanted to play and how I wanted to play.
"The way that I started was one of the best starts that I've had in my career," added the English-born Queenslander, who at one point struck three sixes in succession off Rishad Hossein as he enabled Australia to bounce back from 3-44 to rack up a formidable 5-196
"I was really pumped, and then to go on and make the score I did and set the team up for a good win was really good in this format."
After losing the ODI series 2-1, player-of-the-match Renshaw, who shared in a key partnership of 97 with Tim David (45 off 26), admitted it felt "a little bit" as if a score had been settled with the T20 triumph.
"There were a few really good games in the one-day series. It felt like every game we were just a little bit shy. We were probably 20, 30 runs short in a couple of games," he said.
"These last two games, it's nice to sort of get a little bit of the rub of the green, especially since it's been a tough tour wins-wise."
Renshaw also proved his worth again as a bowler, chipping in with a key caught-and-bowled to get rid of dangerous opener Tanzid Hasan for 30 off 15 balls, a key moment as Bangladesh went on to fall just short on 6-189.
A part-time offspinner, Renshaw has still managed to be Australia's most prolific wicket-taker on tour with eight scalps.
"Apparently my bowling's not great. I saw a little titbit from one of the Bangladeshi players," he laughed.
But he was keener to enthuse about the bowling of teammate Nathan Ellis, who went for a miserly 1-27 off his four overs.
"Watching him go about it, the way that he can execute the slower balls, he doesn't give the batter a really good read. I think it's probably some of the best death bowling I've seen," said Renshaw.
