The only time I bathe my snakes is when they smell bad from slithering in their waste. I just fill a tupperware container with 2 inches of water and put them in. I leave it uncovered. I don't use soap.

My girls just chill there and will sometimes start drinking the water. I usually leave them in for about 10 minutes or until they get restless.

You don't really need to bathe snakes. I just do it to get the crap off them.