I sympathise with you, and I think, given his age, you should be able to expect a reasonable standard of hygiene and tidiness. Whether you will get it is another matter - my daughter was genuinely awful when she came back from university. We had some serious set-to's about it. It lasted until she got a place of her own. The transformation was remarkable! My son was extremely tidy whenever he was at home - having been at boarding school where he had to be, and then into the Services. He's never been any different, he likes and expects order but is now in the same position as you, having a stepson who comes home from uni and lives like some sort of junior Mr Trebus, which sends DS into a decline. If you're not prepared to throw him out just keep chipping away!
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Harry and Meghan ‘royal’ tour of Nigeria.