Thank you all for your replies, especially the mroe constructive ones @Bunny and to that person who asked I am not deranged but expect a certain propriety from my guests.
For those more interested in the previously mentioned obnoxious guest, there was more to it than the stained sheets (so bad they had to be binned). We are talking A sex here. He dumped open bags of rubbish (what you lot probably call garbage) in my car parking area and that included 4 empty bottles of Vodka and the pile of dirt/food stuff on the lounge floor suggested they had a party at the house. When contacting about the sheets he was bullish and denied it. Airbnb were not very pro-active and I was a bit of a newbie so I started investigating him. No reviews but he had bragged that he worked for a well know American financial publication. Excellent news for me as it took 20 seconds to find his and his workmates email addresses. So I sent the pics of the sheets and details of our conversation to all his workmates. Sounds reasonable to me. Also lots of items on G of him downing multiple shotts of Vodka in Russia in drinking competitions.
Addtionally, a more detailed look at the Arirbnb site showed he had stayed previously at a house in central London with M. I contacted M and she was happy to tell me of her experience and how her housekeeper was appalled at the state of the bedding which again was binned.
I am sorry dear readers that some you find this such a sensitve topic. May I suggest the forum manager points this out to truth sayers such as myself when they join. Something like ‘no sex we’re sensitive people who let our Airbnb guests defecate all over us’.
Again thanks for the positive responses.