The home we just bought has a jacuzzi tub. I believe this was added in the early 90's. As shown in the photo, there is a deep, narrow storage cabinet (13" wide openings) at the end opposite the faucets. That is the only access panel. That access panel is 13" x 12" and was covered with a screening and then a piece of cardboard. I removed the cardboard and there is a strong mildew smell. I set up a fan to blow in to circulate air, and sprayed a lot of lysol through the opening; but after a few weeks the smell is still there. What is my next step? The long side of the tub is against an exterior wall. Should a panel be cut there (to air out and also for repairs), and how would that best be done? Any suggestions appreciated!