Remember that dishwashers use less water than washing dishes by hand, about 6 gallons less per load; dishwashers also use hotter water than you would use if you were washing the dishes by hand, so they can do a better job of killing germs.
One way to help either screws and nails penetrate wood without splits is to use beeswax on the fastener. In fact, some carpenters will drill a hole in the end of a wood hammer handle to fill it with beeswax. An alternative is to buy a wax seal for a toilet. It's made of beeswax processed to stay soft, and costs much less.