White Powder Under 2019 Montana Fifth Wheel Valance

[lewy64]

tried searching on this here and online no help. I have a 2019 Montana 5th wheel, outside under the valance there is a big open area near my dump tank opening, I took a picture of it I will attach it, but it is all on the top of the floorboard where the black fabric, or insulation, I have not touched it, it is not under or above anything, the power connection and water heater are like 3-4ft away

 

[lewy64]

here's the pics

 

[lewy64]

I scraped it with a stick and it's just a fine powder, the storage area is right above that

 

[DadsHemi]

Maybe some sort of mold

 

[RMcNeal]

Powdery Mildew?

 

[lewy64]

not sure, some searches suggested carpenter ants, we had a colony here, but I think I destroyed them

 

[RMcNeal]

If it is carpenter ants and you still have an issue, try Bifen IT from doyourown.com. It is extremely safe to use, even indoors, and will kill any bug you can find. In strong mixes it is a termiticide, but for basic yard or in home extermination, you can mix 2-3 oz. per gallon of water and spray maybe twice a year. We've never had fleas, ticks, ants, or much of anything else in the yard, and you can forget about roaches. And we live in Florida!

 

[Route 66 Rambler]

Are your batteries about there? Could be leaking battery acid.

 

[Mikendebbie]

Look at the floor plan screen shot below…is the spot located at A B or C?
I’m betting 25 cents that it is something that spilled on the floor structure at the factory.
Also the thought crossed my mind that something sprayed thru that hole in the frame just below the white spot. I would not worry about it. Keep an eye on it to make sure it does not “grow” or get bigger.