The idea of sports washing is one of the most ridiculous concepts I've ever heard. Owning a football club, and, no offence to City, PSG or Newcastle, especially a club the size of United, will do the exact opposite of 'sports washing' by drawing a large spotlight onto their country. For a country like Qatar, with dangourous and powerful enemies nearby, drawing that spotlight is part of their motivation, along with diversifying their interests for the day the gas (or oil in other cases) runs out, and gaining the influence and soft power that owning a club with world wide clout like United provides them with.