Good day folks. I am seeking advice and recommendations for cleaning my skylights. History: Quadrafire Mt Vernon AE installed in 2011. Have been burning Hamers until then 25-26 season when I switched to Forest Fuels 100% oak pellets. They burn almost as well as the Hamers. Every year or two I've had to clean the skylights on either side of the exhaust which is about 3-4' above the skylights. In past years I've been using CLR to clean the skylights. This year, burning Forest Fuel pellets, the residue on the skylights ( see pictures) is much worse and the CLR seems to have little or no effect on it. I apply that it with a spray bottle, wait a bit and use a plastic brisle brush to clean much to no avail and rinse with water. I am seeking any advice or recommendations to help clean the skylights. Thank you.