By Christine from DE
Here are the recent answer to this question.
Make sure that the vents that go under the house and the one leading from the drains in the bathroom to the roof are not blocked. I use to open up a bit of the skirting on the side that the wind blows from and a bit on the opposite side. Usually, after a couple of days the ground dried out the smell was gone, and I put the skirting back in place. Fling some laundry soap under the house if you see moss or mold growing.
By Louise B. 08/29/2010
It has been a long time since I lived in a mobile home, but this sounds like a moisture problem to me. I don't believe that spraying the ground with anything will help. I would make sure that you have good air circulation under the trailer. Open up crossvents, and maybe you need to set up a fan to dry it out. I think you should check with other mobile homeowners in your area to see what they do for ventilation. I am sure that your problem is not unique to your home, but it would be quite different in a different climate.
By Nan Corpe 08/27/2010
I hope you get a better answer, but at least I can tell you that it sounds like moisture is forming under the house, and perhaps forming mold. Since mold can be dangerous, you need a way to let water escape from under the house rather than being trapped under it.
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