How can I communicate effectively what I expect? I have heard that a solution is to get duvet covers and wash them between guests. I do not want to do that. I also do not want to assume anything based on a person's looks or language and I do not want to offend. When it is clear that they slept on top of the bedspread with another blanket on top, I need to wash a lot of bedding! And it will cause the bedspreads to wear out sooner. I am considering putting an extra charge if I find this situation, but it is a little difficult to prove beyond any doubt.