ROWHARD--- I would try the WINDEX idea first on a sample cladding location, as it is an extremely "mild" cleaner and won't harm anything. If that doesn't work well; then upgrade to 409 Cleaner, as 409 is a bit more powerful than WINDEX. It is always wiser to begin with a mild type cleaner, and then gradually upgrade to a stronger cleaner as required to accomplish the mission. SIMPLE GREEN; might be an option, too. AIM HIGH!!!