To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Are use this product to clean out my coffee stains in my thermos Bottle. It did not clean either one of them. It did nothing for them. I would not recommend this product to anybody. It was a waste of money and time. Try a different project!