Several months ago someone here asked about anyone who had experience with Vacuwash. They clean sails, canvas and upholstery using a vacuum chamber that draws the cleaning chemical into the fibers. We stopped there today and dropped off our interior upholstery (Alcantara) and exterior canvas which had mildew spots. The results they've gotten for others convinced us to give them a try. I'll let you know how it turns out when we get everything back next week.