Amadou is good stuff and well worth either the money or the hard work needed to obtain it. It is quick to use, which when Sport is brisk proves advantageous.
First get your fly wet.
Lay the wetted fly in the Amadou and press it firmly.
The water comes out of the fly into the Amadou, making a temporary "Water Fossil".
The fly is restored to "as new" condition, ready for you to get it wet again...