A person accidentally poked his eye with his finger. So he had to warm his eye by covering his eyes with a cloth that was warmed(cloth) by bringing it close to the mouth and breathing on it:
So what is to be used?(while telling someone how to do it)
A cloth has to be warmed by bringing it close to your mouth and warming it with your breath and then do the warm compress.
Is there a shorter way to express the bold line that sounds more natural in everyday English?