When I got my car, it had spent weeks outdoors with a window open and the driver's seat had mold on it. Griots Interior Cleaner worked for me on black. On a lighter color you might need to re-dye after cleaning.
We have it too. I had some nice old Harley seats sitting in a dank closet and they had some mold going. I used lysol and a rag and also 409 with good success at removal and then hit them with some leather conditioner. Time will tell when I visit them again. Good luck
FL too humid (like the rest of the entire east coast), S Cal way too dry (and v expensive), AZ not enuf water to go around, mexico too much poverty/crime, china/India too crowded, Europe in dire straits economically. FL not so bad, eh? LOL
As an aside. Humid, dark areas that are not air conditioned should have a light on all the time. Closets, crawl spaces used for storage, etc. I keep a 13W fl. bulb in my storage area and never have mildew. I learned from SE Asia where all closets had lights.
I would use a damp towel and wipe down the seats and then just use a dry soft cloth to buff them. Did this to some Barcelona chairs which had a similar issue due to FL climate worked perfectly.
I've used both undiluted white vinegar and also a 50/50 mix of water and rubbing alcohol with success. Even a cup of laundry bleach or borax in 1 gallon of cool water will do the trick. Use a clean rag dipped in the solution of choice and thoroughly go over all areas of the seats and trim. Let the seats dry out well, and then apply the very best leather conditioner you have. When my car is left idle for more than a week or so, I place a dessicant can on the floor to deal with the humidity. You can even make your own! "Borrow" a large (quart sized or more) Tupperware plastic container with a lid from your wife... Place a bunch of holes in the lid with a hot nail or whatever, and fill up about half of the container with a dessicant. I bought a bunch of silica gel dessicant packets on e-Bay. You can use other chemicals, but silica gel works like a charm. Go on e-Bay and you'll find 500 silica gel packets for about $25.00. As an alternative, you can search for bulk silica gel... The advice about having a light source in the stroage area is right on! Best wishes! Image Unavailable, Please Login
Desiccant is a great idea. I use these in my cars. Amazon.com: Dry-Packs 750 Gram Silica Gel Canister Dehumidifier - Moisture Indicating: Home & Kitchen Image Unavailable, Please Login
The vinegar works great. Look up on the internet and read a few instructions. I had a friend with a boxer with very bad mold. Used the vinegar and then leatherique and it was like new. be careful it can strip the silkscreen off the AC controls etc.... I think I wiped it on the off with a wet towel, then the leatherique. I would experiment a bit. Rob Image Unavailable, Please Login Image Unavailable, Please Login