I responded to your personal Email Address just a little while ago, check your email.
As per cleaning - Make sure any debris is out of the Sunroof Rail or Lower Tub Assemble ie, Leafs,Twigs,Egg Corns,Gremlins....., Make sure that the underside of the Sunroof Glass were it meets the Rubber Seal is Clean, (Use a Window Cleaner) to clean the bottom rim of the glass and a silicon spray to soften the rubber seal located under the glass to keep it flexible and soft from the elements.
We use a High Temp White Spray Grease to keep the rails sliding freely within the Sunroof. (High Temp) is a Must anything else will break down do to the large amount of Heat Build up from mother nature.
Make sure all screws are snug, and not loose
Be careful of the drain tubes below the headliner board, remember you only have 2 drain tubes on a discovery, they break often with little reason.
Hope this all helps.
Let me know if i can help you in any way. Bill
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