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At a RV Park for a week in our Big Sky 3580 RL. We were leaving this morning and the wife was cleaning under one of the recliners in front of the rear window. Under one of the recliners there was a wet spot on the rug about the size of a dinner plate. No one knows of a spill that would be under the center of the recliner. Any ideas how it got wet under a chair with no water lines or anything near the area?