I prefer using wood or bamboo boards, and I clean them carefully. I do not use the dishwasher on wood or bamboo.<br><br>
Cooks Illustrated recently did a study where they compared the bacteria levels on wood, plastic, and bamboo cutting boards after washing them with different methods.<br><br>
First they sent wood, bamboo, and plastic cutting boards to an independent lab. The lab colonized the three types of boards with salmonella bacteria, then cleaned them with diluted bleach, full strength vinegar, or hot soapy water. They found that hot soapy water cleaned all of the cutting boards just as well as bleach or vinegar.<br><br>
Then they had another independent lab test which type of board material cleaned up the best: wood, bamboo, or plastic. Apparently the bamboo had antimicrobial properties, but all three materials came back perfectly clean and free of bacteria.<br><br><b>So don't worry about your materials: a wood cutting board washed well in hot soapy water is every bit as safe as a plastic one sanitized in bleach water.</b><br><br>
Cooks Illustrated also did a test of various cutting board materials to see which ones had the best durability and were friendly to knives. They found that end-grain bamboo cutting boards were the very best (not horizontal grain: you want it to look like miniature butcher block). So if you get end-grain bamboo boards you get the best of all worlds: a pretty and durable board, the one that is easiest on your knives, and it has anti microbial properties as well!