What i do is take a tupperware container and fill it with hot water, put the rat in, and put the lid on. Itll trap the heat in the container and thaw the rat out completely and get it up to a good temp for the snake to sense it. I wrap it up in a papertowl to get excess water off and then feed it to the snake. It doesnt mind it being wet at all. I think it prefers it because the body of the rat has a more live soft feeling.