Helps some but not as much as I'd like
First, I was shocked to get the bottle in a baggie with a wet note telling me the bottle leaks.  So I'm storing the bottle in it's baggie so it doesn't leak all over my kitchen counter.  Second, if there were instructions as to how to uses the product, such as how much to pour, how long to let it sit, water temperature, etc., I didn't see them.  I soaked a pretty coffee-stained cup overnight and it had some residual stains after I rinsed it with near boiling water and dish soap.
Rating: 3 stars