Overpriced junk
Thought I'd give it a try on my vinyl auto-cover.  The bottle is nice and puts out a very strong stream.  But as far as the effectiveness of the product, it's no better than using any other mild detergent like simple green or 30 second outdoor cleaner.  This removed light surface dirt and that's about it.  It did nothing for stubborn stains / mildew / mold on the cover.
Rating: 2 stars