I have never used furniture polish on isenglass before but I bet my young kids would love it because then they could draw pictures on the windows since it is so greasy. Personally, I use Plexus but there are many products made specifically for isenglass and other plastic items like the hatches, port windows, sliding cabin door, etc.. I usually buy it from the boat supply stores but don't know if auto stores or the like carry it.

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Current Boat: 2000 Four Winns 298 Vista
Previous Boat: 2000 Carver 406MY