Trailer Smells After Winterizing

[Csmccharlie]

So went into my camper for the the first time since winterizing it a week or two ago. Not sure if its coming from the black tank but that has about a 1/2 gallon of antifreeze in it and an inch or two in the trap for the toilet. Or the hot water heater that smelled really sulfury the 1st and only time we took it out for 1st day or so.

Any suggestions on cause and or solutions

[JRTJH]

Are the sink/shower drain P traps dry ? If they are, the odor from inside the tanks would "waft up through the plumbing"...

[Csmccharlie]

I poured about a qt of antifreeze down each. Maybe it needs more

[Northofu1]

Little trees
I'm partial to these
https://www.walmart.ca/en/ip/Little-...E&gclsrc=aw.ds

[RagingRobert]

As long as it's not mouse poop/pee you'll be alright
Not sure what you guys do but since I had a minor mouse issue I now spray the underside with that "mouse proof" stuff and leave small dishes of peppermint oil in the RV...not a mouse since.

[Csmccharlie]

I am trying battery powered sonic deterants under it and going to do a 5 Gallon bucket trap.

[JRTJH]

I use Cab Fresh, a "bontanical rodent repellant"... It smells sort of like a mix of balsam, pine, cedar and some flowery stuff tossed in... In other words, much like the stuff in those smelly bags they sell in every gift shop at Christmas. It comes in something that resembles a "big teabag". They are sold in 4 packs.

I use two boxes of Cab Fresh (8 bags total) for the trailer and it smells "fresh and outdoorsey" all winter long.