What part of France do you live? I'm an expat myself and recently started a mobile detailing business in the Languedoc region and I fear,here in the south its the latter. However, try to offer smart repairs and aim for guys who want to sell their cars.
UK expat living in France here, just wondering what the demand is for ultra clean cars and ultra tidy garages in France? Are we as obsessive as the Americans (actually I am...), or do we all just drive around in filthy old Safranes not giving a damn? Lol