Originally Posted by trode
Here's what doesn't make sense about all the above responses. This has occurred in EVERY rv I have owned, 3 TT's and this motorhome. All have been stored in different places, in different circumstances. It happens where ever we are as soon as she returns to the rv. Thought of some things that I have changed, i.e. toilet chemicals, soaps, etc.. still happens whenever she gets in.
Hard to think mold has been in all 4 rv's in adequate concentration, and not new units, and no new carpet or components... keep ideas coming.
So... not being accusatory, just analytical... the common denominator is you and how you use your rig(s). Do you control humidity? We noticed that just our breathing and running the heat was causing the humidity to rise, especially at night. That's really all mold needs to thrive. We purchased an over-sized dehumidifier and run to maintain 45-55% humidity (that's what the wood trim likes).
Want to poke around and look for mold? In our rig, there is a metal cover (which is uninsulated) under the closet in the back which is directly over the engine (take out the drawers to find). Look anywhere where the heat of the inside and the cold of the outside are closest to interacting. Another spot is around the windshield and under the dash.
If you find it, although the EPA would say to get a mold abatement contractor (yeah, right), I just used Windex Multi-Surface and lots of paper towels. Heavily spray an area and, after only one pass, out the door it went into a plastic trashbag. Yes, it made for several rolls of paper towels and even more trips from the spot to outside the rig... but I felt confident that that was the best way to trap and remove without releasing. For example, folding over and making another pass might have had the possibility of disturbing and releasing the previously wiped proceeds.
Anyway, dehumidifier in the winter set to 45-55% did the trick. Actually, in the summer in very warm, humid climates, I've found the dehumidifier also helps the AC units control the temps better. So I run it year-round.
Note: I'm not recommending someone else do their own mold removal... I'm just telling you what I did. Ultimately, I didn't really want to put that part of the story in writing but, for the good of future readers, I felt it more important to make it clear that just dehumidifying without removing could result in the releasing of now dried mold spores. So... find the mold, purchase and plug in the dehumidifier and immediately get the mold out before it has time to dry out.