Tyler0215 wrote:

You said this is a used unit. You don't know how clean the previous owner kept the bathroom.
Drain the tank add some bleach and a lot of water. 3/4 a tank at least, drain and repeat. Same with the gray tank.
Clean the bathroom really well, outside of toilet, walls, floor, inside of cabinets. If you still have the odor, clean again.

Durb wrote:

You probably have automatic vents for the gray tank under your kitchen counter and under the vanity in the bathroom. If these go bad, and they do, your gray tank will gladly share all its smells with the trailer. I hope your drain valve is not open and you are not hooked up to the park's sewer. If so, and with bad auto vents, you will get to enjoy the sewage smells of all your neighbors. Some people insist on doing this, can't figure out why.

Try filling your traps slowly in the kitchen and bathroom, then wrap plastic wrap over the auto vents with a rubber band. See if the smell goes away. Could be, the auto vents don't open and are causing your traps to siphon dry.

I would also consider previous mice and rats as being an issue. They don't see well, so they pee everywhere to help them navigate by smell. Stick your head in a storage compartment to see if it is worse. Also, remove an electrical outlet to access the inside of a wall, and give the hole a good whiff. No help here as how to remedy.

I hope your problem is from the auto vents; they are cheap and easy to replace. Who knows, maybe the previous owner liked to eat asparagus and urinate in the shower which goes right to the gray tank.

Boon Docker wrote:

"It was a hot three days with much peeing and very little flushing."

That could be the problem.

pbitschura wrote:

Indeed. Much less water conservation next time and we'll see.