From the current beacon of knowledge, the FDS web site:
http://www.watchtower.org/library/rq/index.htm?article=article_09.htm
5. Physical Cleanness: Because they represent God, Christians should keep their bodies and clothing clean. We should wash our hands after using the toilet, and we should wash them before eating meals or handling food. If you do not have a proper sewage disposal system, toilet wastes should be buried. ( Deuteronomy 23:12, 13 ) Keeping physically clean contributes to good health. A Christian's home should be neat and clean both inside and outside. It should stand out in the community as a good example.