My rat source (BulkMice) here in Houston is also very good about giving clean rats. I have never dried my rats after I thaw them and I serve them soaking wet. Its much easier than heating them all up with a H.D. and my snakes get plenty to drink with their meal. Its a win-win and my snakes never complain about it.
I believe this has to be a trick question so Im going to say that a rat heated by a H.D. smells like cotton candy. Rat, is just too obvious of an answer.