To wash cycling shorts every day is a scandalous waste of water resourses especially when millions of people throughout the world have to walk miles to get access to clean water. Cleaning your shorts once a week is fine. I doublt that you wash you suit or ovearalls more than once a week and you bike clothing is no different. For godsake lets show some common sense and responsability to the environment and the wider world.
Who says you have to wash them every day. Change them everyday and wash all of them at the end of the week...