Hope it helps. Indie's ears get really hot and moist too, and though I try to flip them over to air them when he's asl;eep, it's still a problem. The thornit stuff seems to keep them really dry and clean, he just gets a teeny amount when he needs it, maybe once a month now, and no problems since.
He's had lots of brown wax at one point too, and a tiny amount of the powder clumped it up enough to be easily removed, fab stuff.
Good luck.