Thunder Force's running joke about Lydia's (Melissa McCarthy) smelly super suit begs the question of if Iron Man dealt with the same problem. Emily (Octavia Spencer) comment they are unable to wash their suits, due to the material they're made out of. Tony Stark's suit appears to be made out of similar material, which means that he was likely unable to clean his after battles as well.
Thunder Force takes place in a world where cosmic rays inadvertently created super powered-humans called Miscreants. After these super people tragically killed her parents, Emily vowed to create a treatment that could turn anyone into a superhero so they could fight the Miscreants. She is eventually successful, which leads to Emily and Lydia taking the treatment themselves. After developing super-strength and invisibility, the pair become the crime-fighting duo Thunder Force.
Every superhero needs a super suit. Thanks to over a decade's worth of Marvel movies, audiences are more than familiar with the superhero get-up. But Thunder Force addresses an amusing issue those movies fail to address — superhero armor is nearly impossible to clean. Avengers: Infinity War commented on a new-suit smell, so it can only be assumed that those suits begin to smell unpleasant after battle. As Iron Man spent a decade fighting in a metal suit, Thunder Force's joke puts things in a brand new perspective.
Infinity War introduces Peter Parker's Iron Spider suit. It was designed by Tony Stark, and looks like the Iron Man version of Spider-Man's classic suit. That means it's made of the same iron and metal that comprised Tony's suit. The first moment Peter wears the suit, he tells Tony that it smells like a new car. That new-suit smell likely quickly faded away with the more use it got. During his time as an Avenger, Tony was always on the front line of battle. All of that fighting likely led to a lot of sweating. As Tony could not easily clean the inside of his suit, that means he likely experienced a similar situation to Lydia.
Thunder Force doesn't hold back when it comes to poking fun at the superhero movie genre, like its joke regarding the secret identity trope. But its commentary on the smell of superhero armor definitely puts a superhero like Iron Man in a new light. While Tony's death in Avengers: Endgame cemented that he was truly a brave and selfless hero, he was always known for being a little vain. So he likely would have never shared with his fellow Avengers that sweating in his Iron Man suit caused it to smell - or otherwise built a hilariously complicated contraption capable of handling cleaning his super suits. Either way, this scenario will remain a humorous Easter egg for fans whenever they revisit Tony's arc in the MCU, thanks to Thunder Force.