Janne uses fuel to make the sauna stones hiss
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Janne attempts to spray the sauna stove with a hose, but the water pressure is not strong enough for the water to reach it.
He then fills a water balloon with lighter fluid, thinking that he could throw the balloon at the stove.
Instead, he realises it would be easier to create a long trail of lighter fluid from the stove, back to where he is standing, so he can light the trail from a distance.
However, this plan does not work out for him.
He also tries to make a flammable trail out of hand sanitiser and matches, but this plan also fails.
His only official successful attempt is when he squirts the fire with lighter fluid from a distance of 10 metres and 75 centimetres.
(Written by TRoosevelt1776 and proofread by Karl Craven)