Gray Water Smell
OK, another new RV'er question here. Our RV has been parked for a few months after a short trip which included a stop at the dump station (black and gray tanks ware dumped). Black water tank is serviced and no smell problems. The bathroom sink and kitchen sinks tell another story. When I remove the sink stoppers, the smell is very strong - a bit like onions or something along those lines. We don't put food down the kitchen drain so this is a bit of a surprise. Of course, the easy thing to do is to keep the stopper in place - yep, that sill stop it. But, can't do that forever. I'm looking for ideas or suggestions. The gray holding is almost empty since we dumped it in the spring.
Thanks for your help!