From NY Times, 01.30.04:
Chuck Gerba, a professor of environmental microbiology at the University of Arizona who has studied bacteria in home kitchens, said that he found that people who had the cleanest-looking kitchens were often the dirtiest. Because "clean" people wipe up so much, they often end up spreading bacteria all over the place. The cleanest kitchens, he said, were in the homes of bachelors, who never wiped up and just put their dirty dishes in the sink.
I thought I was a clean cook. It is true, I wipe up a lot!