The usual advice is to keep the drain open by regularly cleaning it out with pipe cleaners. Check inside the cabinets on the slide to see if you can access from below - I believe you can but beware of gravity emptying the contents into the interior of the cabinets. Easiest way is to remove the slide topper awning and clean out from above. Cleaned mine out when I replaced the topper awning. Think you will find there is not as much moisture or mud as you thought. Good luck.
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Bob
09 Journey 39Z
Southern Ontario
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