Posted: Today at 06:09
Never heard of it Michael - what is it you want it to do?
There is a type of grass called Fescue, the seeds of which are often included in a mixture for lawns - it grows well in shadier areas. Could this be what you've heard about?
Or there's a product called Lawn Rescue which is used to treat areas of lawn damaged by dog urine.
Some photos of your lawn and more information might help us to help you