Had that same problem last year with the Sunnybrook. Since it does not get any direct sunshine on it because of the full awning cover, mildew has been a bad problem. While we gone to Alaska this summer, we used a Dehumidifier unit with the drain line run to the shower. Since the coach is hooked up to exterior black water septic tank, the water just runs out. When we reurned after 4 1/2 months, the Rv inside was great, the air inside had a scent almost like rose's. Today in the fall, we supplment the propane furnance with electric haet, does a good job as the propane does have a high moisture content.