Great tutorial on how to clean your washing machine with just baking soda and vinegar. Easy, fast way to get rid of the smell and mold on front loading washing machines, but this method should work on top loading washers as well.
DIY Washing Machine Cleaner: 2 c. of white vinegar, split between the detergent dispenser and the rest into the basin. Turn the washing machine on to the "clean washer" setting. After that is done, sprinkle about c. baking soda in the basin.