Feed your ball python, then leave it (if f/t or pre killed). Animals have instincts and either he will figure it out or he won't. Truly. The next morning you will find either the rat uneaten or you will find a fat happy BP. There is no reason for you to help and there is especially no reason for you to give it a bath because it has rat guts all over him. Maybe 2 days afterward (at the least) give him a warm soak. Besides that, it's really unnecessary and probably detrimental.
Remember these guys have survival instincts and they will eventually figure it out