Putting Black Tank Chems in Grey Tank?

Do you rinse dishes with food particles on them? Greasy stuff? Coffee grounds? All of this can contribute to a smelly grey tank/traps. It's best to take a used paper towel or napkin and wipe the dishes into the wastecan before washing.

also if you have a washer dryer and haven't used it in awhile, add some water to the washer and run the spin cycle.

Replace the air admittance valves - they are cheap and as others said. If they aren't working, you will smell the grey tank. There should be one under each sink.

If we are staying more than a couple of days, I always add one scoop of Happy Camper to the sink. Never had an odor problem and it helps to keep the gray tank squeaky clean.

I hadn't really thought about the traps. I'm going to remove them and clean them out. Thanks
Brian

We had a problem one time when we were camping in hot weather with grey tank odors from the kitchen area (has its own tank). I couldn't figure out where it was coming - trap was full and I even sealed the air admittance valve with a sandwhich bag and a rubber band. It still stunk so I dumped a bunch of chems down there.
Later on I think I figured out where the smell came from.
I pulled the fridge out one winter to fine-tune its install (it was along winter..) and found that the gey tank had a vent stack that came up next to the fridge and just dead ended about 6~10" below the ceiling. So if the fumes got bad enough they would just escape around the fridge.
I used a couple of fittings to extend the end of the pipe up into the roof vent for the fridge and never had the smell issue again.

Are you sure its the traps that stink, and not bad air admittance valves ??

Eliminate the cause of the smell. Don't just mask it. Use some bleach and Dawn.

ScottG wrote:
. . . wont hurt the plumbing and rubber seals like more caustic stuff can.

If by "caustic stuff" you mean bleach, then don't worry -- unless you're talking about Harbor Seals or Baby Harp Seals.

downtheroad wrote:
Won't hurt a bit. But, the traps under your sinks and shower should prevent the odor you are reporting...

Agree, you don't need any of that stuff, that's what the traps are for...just like at home.